Due to insufficient escaping of the ampersand character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 139, Firefox ESR < 115.24, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This vulnerability     affects Firefox < 139, Firefox ESR < 115.24, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird <     128.11. (CVE-2025-5265)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7663-1 advisory.

    Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially     crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of     service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute     arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-a52491bdd9 advisory.

    Update to 128.11.0

    * https://www.thunderbird.net/en-US/thunderbird/128.11.0esr/releasenotes/
    * https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01946-1 advisory.

    Update to Mozilla Thunderbird 128.11 (MFSA 2025-46, bsc#1243353):

    - CVE-2025-5262: Double-free in libvpx encoder (bmo#1962421)
    - CVE-2025-5263: Error handling for script execution was incorrectly isolated from web content     (bmo#1960745)
    - CVE-2025-5264: Potential local code execution in 'Copy as cURL' command (bmo#1950001)
    - CVE-2025-5265: Potential local code execution in 'Copy as cURL' command (bmo#1962301)
    - CVE-2025-5266: Script element events leaked cross-origin resource status (bmo#1965628)
    - CVE-2025-5267: Clickjacking vulnerability could have led to leaking saved payment card details     (bmo#1954137)
    - CVE-2025-5268: Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and     Thunderbird 128.11 (bmo#1950136, bmo#1958121, bmo#1960499, bmo#1962634)
    - CVE-2025-5269: Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11 (bmo#1924108)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of thunderbird installed on the remote host is prior to 128.11.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2873 advisory.

    An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This     vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1.
    (CVE-2025-4918)

    An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array     index sizes. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR <     115.23.1. (CVE-2025-4919)

    Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR     < 128.11. (CVE-2025-5263)

    Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5264)

    Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's     system.*This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This     vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5265)

    Script elements loading cross-origin resources generated load and error events which leaked information     enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.
    (CVE-2025-5266)

    A clickjacking vulnerability could have been used to trick a user into leaking saved payment card details     to a malicious page. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11. (CVE-2025-5267)

    Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139 and     Firefox ESR < 128.11. (CVE-2025-5268)

    Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. This vulnerability affects Firefox ESR < 128.11. (CVE-2025-5269)

    Use after free in libvpx in Google Chrome prior to 137.0.7151.55 allowed a remote attacker to potentially     exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

    Duplicate: https://console.harmony.a2z.com/al-cve-eval/cve/TEMP-1106689-EC87F6 (CVE-2025-5283)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2025-996 advisory.

    An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This     vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1.
    (CVE-2025-4918)

    An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array     index sizes. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR <     115.23.1. (CVE-2025-4919)

    Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR     < 128.11. (CVE-2025-5263)

    Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5264)

    Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's     system.*This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This     vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5265)

    Script elements loading cross-origin resources generated load and error events which leaked information     enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.
    (CVE-2025-5266)

    A clickjacking vulnerability could have been used to trick a user into leaking saved payment card details     to a malicious page. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11. (CVE-2025-5267)

    Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139 and     Firefox ESR < 128.11. (CVE-2025-5268)

    Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. This vulnerability affects Firefox ESR < 128.11. (CVE-2025-5269)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of firefox installed on the remote host is prior to 128.11.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2FIREFOX-2025-039 advisory.

    An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This     vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1.
    (CVE-2025-4918)

    An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array     index sizes. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR <     115.23.1. (CVE-2025-4919)

    Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR     < 128.11. (CVE-2025-5263)

    Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5264)

    Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's     system.*This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This     vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11. (CVE-2025-5265)

    Script elements loading cross-origin resources generated load and error events which leaked information     enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.
    (CVE-2025-5266)

    A clickjacking vulnerability could have been used to trick a user into leaking saved payment card details     to a malicious page. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11. (CVE-2025-5267)

    Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139 and     Firefox ESR < 128.11. (CVE-2025-5268)

    Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. This vulnerability affects Firefox ESR < 128.11. (CVE-2025-5269)

    Use after free in libvpx in Google Chrome prior to 137.0.7151.55 allowed a remote attacker to potentially     exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

    Duplicate: https://console.harmony.a2z.com/al-cve-eval/cve/TEMP-1106689-EC87F6 (CVE-2025-5283)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-34badbe9b9 advisory.

    - New upstream version (139.0)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01814-1 advisory.

    Update to Mozilla Firefox ESR 128.11 (MFSA 2025-44, bsc#1243353):

     - MFSA-TMP-2025-0001: Double-free in libvpx encoder (bmo#1962421)
     - CVE-2025-5263: Error handling for script execution was incorrectly isolated from web content     (bmo#1960745)
     - CVE-2025-5264: Potential local code execution in 'Copy as cURL' command (bmo#1950001)
     - CVE-2025-5265: Potential local code execution in 'Copy as cURL' command (bmo#1962301)
     - CVE-2025-5266: Script element events leaked cross-origin resource status (bmo#1965628)
     - CVE-2025-5267: Clickjacking vulnerability could have led to leaking saved payment card details     (bmo#1954137)
     - CVE-2025-5268: Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and     Thunderbird 128.11 (bmo#1950136, bmo#1958121, bmo#1960499, bmo#1962634)
     - CVE-2025-5269: Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11 (bmo#1924108)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-5bf1989d48 advisory.

    Update to 128.11.0

    * https://www.thunderbird.net/en-US/thunderbird/128.11.0esr/releasenotes/
    * https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01769-1 advisory.

    Update to Mozilla Firefox ESR 128.11 (MFSA 2025-44, bsc#1243353):

     - MFSA-TMP-2025-0001: Double-free in libvpx encoder (bmo#1962421)
     - CVE-2025-5263: Error handling for script execution was incorrectly isolated from web content     (bmo#1960745)
     - CVE-2025-5264: Potential local code execution in 'Copy as cURL' command (bmo#1950001)
     - CVE-2025-5265: Potential local code execution in 'Copy as cURL' command (bmo#1962301)
     - CVE-2025-5266: Script element events leaked cross-origin resource status (bmo#1965628)
     - CVE-2025-5267: Clickjacking vulnerability could have led to leaking saved payment card details     (bmo#1954137)
     - CVE-2025-5268: Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and     Thunderbird 128.11 (bmo#1950136, bmo#1958121, bmo#1960499, bmo#1962634)
     - CVE-2025-5269: Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11 (bmo#1924108)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-thunderbird installed on the remote host is prior to 128.11.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-148-02 advisory.

    New mozilla-thunderbird packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-thunderbird security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-46 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-46 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-45 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-45 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-firefox installed on the remote host is prior to 128.11.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-147-01 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-firefox security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 115.24. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-43 advisory.

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 115.24. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-43 advisory.

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-42 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-42 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-44 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-44 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5283)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
245604	Linux Distros Unpatched Vulnerability : CVE-2025-5265	Nessus	Misc.	medium
242691	Ubuntu 22.04 LTS : Thunderbird vulnerabilities (USN-7663-1)	Nessus	Ubuntu Local Security Checks	critical
241311	Fedora 42 : thunderbird (2025-a52491bdd9)	Nessus	Fedora Local Security Checks	medium
240846	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : MozillaThunderbird (SUSE-SU-2025:01946-1)	Nessus	SuSE Local Security Checks	medium
238348	Amazon Linux 2 : thunderbird (ALAS-2025-2873)	Nessus	Amazon Linux Local Security Checks	high
238277	Amazon Linux 2023 : firefox (ALAS2023-2025-996)	Nessus	Amazon Linux Local Security Checks	high
238254	Amazon Linux 2 : firefox (ALASFIREFOX-2025-039)	Nessus	Amazon Linux Local Security Checks	high
238073	Fedora 42 : firefox (2025-34badbe9b9)	Nessus	Fedora Local Security Checks	high
237786	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : MozillaFirefox (SUSE-SU-2025:01814-1)	Nessus	SuSE Local Security Checks	medium
237628	Fedora 41 : thunderbird (2025-5bf1989d48)	Nessus	Fedora Local Security Checks	medium
237609	SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2025:01769-1)	Nessus	SuSE Local Security Checks	medium
237428	Slackware Linux 15.0 / current mozilla-thunderbird Multiple Vulnerabilities (SSA:2025-148-02)	Nessus	Slackware Local Security Checks	medium
237388	Mozilla Thunderbird < 128.11	Nessus	Windows	medium
237387	Mozilla Thunderbird < 128.11	Nessus	MacOS X Local Security Checks	medium
237386	Mozilla Thunderbird < 139.0	Nessus	MacOS X Local Security Checks	high
237385	Mozilla Thunderbird < 139.0	Nessus	Windows	high
237345	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2025-147-01)	Nessus	Slackware Local Security Checks	medium
237301	Mozilla Firefox ESR < 115.24	Nessus	MacOS X Local Security Checks	medium
237300	Mozilla Firefox ESR < 115.24	Nessus	Windows	medium
237299	Mozilla Firefox < 139.0	Nessus	MacOS X Local Security Checks	high
237298	Mozilla Firefox < 139.0	Nessus	Windows	high
237297	Mozilla Firefox ESR < 128.11	Nessus	Windows	medium
237296	Mozilla Firefox ESR < 128.11	Nessus	MacOS X Local Security Checks	medium

Detections

Analytics

CVE-2025-5265

medium

Tenable Plugins

medium

critical

medium

medium

high

high

high

high

medium

medium

medium

medium

medium

medium

high

high

medium

medium

medium

high

high

medium

medium