In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.

vendor_unpatched cve-2025-49812: Unpatched CVEs for Debian Linux, Red Hat Enterprise Linux, CentOS Linux, Ubuntu Linux (cve-2025-49812)

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02683-1 advisory.

    - CVE-2024-42516: Fixed HTTP response splitting. (bsc#1246477)
    - CVE-2024-43204: Fixed a SSRF when mod_proxy is loaded that allows an attacker to send outbound proxy     requests to a URL controlled by them. (bsc#1246305)
    - CVE-2024-47252: Fixed insufficient escaping of user-supplied data in mod_ssl allows an untrusted SSL/TLS     client to insert escape characters into log file. (bsc#1246303)
    - CVE-2025-23048: Fixed access control bypass by trusted clients through TLS 1.3 session resumption in     some mod_ssl configurations. (bsc#1246302)
    - CVE-2025-49630: Fixed denial of service can be triggered by untrusted clients causing an assertion in     mod_proxy_http2. (bsc#1246307)
    - CVE-2025-49812: Fixed Opossum Attack Application Layer Desynchronization using Opportunistic TLS.
    (bsc#1246169)
    - CVE-2025-53020: Fixed HTTP/2 denial of service due to late release of memory after effective lifetime.
    (bsc#1246306)

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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02682-1 advisory.

    - CVE-2024-42516: Fixed HTTP response splitting. (bsc#1246477)
    - CVE-2024-43204: Fixed a SSRF when mod_proxy is loaded that allows an attacker to send outbound proxy     requests to a URL controlled by them. (bsc#1246305)
    - CVE-2024-47252: Fixed insufficient escaping of user-supplied data in mod_ssl allows an untrusted SSL/TLS     client to insert escape characters into log file. (bsc#1246303)
    - CVE-2025-23048: Fixed access control bypass by trusted clients through TLS 1.3 session resumption in     some mod_ssl configurations. (bsc#1246302)
    - CVE-2025-49630: Fixed denial of service can be triggered by untrusted clients causing an assertion in     mod_proxy_http2. (bsc#1246307)
    - CVE-2025-49812: Fixed Opossum Attack Application Layer Desynchronization using Opportunistic TLS.
    (bsc#1246169)
    - CVE-2025-53020: Fixed HTTP/2 denial of service due to late release of memory after effective lifetime.
    (bsc#1246306)

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 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-2025:02684-1 advisory.

    - CVE-2024-42516: Fixed HTTP response splitting. (bsc#1246477)
    - CVE-2024-43204: Fixed a SSRF when mod_proxy is loaded that allows an attacker to send outbound proxy     requests to a URL controlled by them. (bsc#1246305)
    - CVE-2024-47252: Fixed insufficient escaping of user-supplied data in mod_ssl allows an untrusted SSL/TLS     client to insert escape characters into log file. (bsc#1246303)
    - CVE-2025-23048: Fixed access control bypass by trusted clients through TLS 1.3 session resumption in     some mod_ssl configurations. (bsc#1246302)
    - CVE-2025-49630: Fixed denial of service can be triggered by untrusted clients causing an assertion in     mod_proxy_http2. (bsc#1246307)
    - CVE-2025-49812: Fixed Opossum Attack Application Layer Desynchronization using Opportunistic TLS.
    (bsc#1246169)
    - CVE-2025-53020: Fixed HTTP/2 denial of service due to late release of memory after effective lifetime.
    (bsc#1246306)

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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02685-1 advisory.

    - CVE-2024-42516: Fixed HTTP response splitting. (bsc#1246477)
    - CVE-2024-43204: Fixed a SSRF when mod_proxy is loaded that allows an attacker to send outbound proxy     requests to a URL controlled by them. (bsc#1246305)
    - CVE-2024-47252: Fixed insufficient escaping of user-supplied data in mod_ssl allows an untrusted SSL/TLS     client to insert escape characters into log file. (bsc#1246303)
    - CVE-2025-23048: Fixed access control bypass by trusted clients through TLS 1.3 session resumption in     some mod_ssl configurations. (bsc#1246302)
    - CVE-2025-49630: Fixed denial of service can be triggered by untrusted clients causing an assertion in     mod_proxy_http2. (bsc#1246307)
    - CVE-2025-49812: Fixed Opossum Attack Application Layer Desynchronization using Opportunistic TLS.
    (bsc#1246169)
    - CVE-2025-53020: Fixed HTTP/2 denial of service due to late release of memory after effective lifetime.
    (bsc#1246306)

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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2025-1125 advisory.

    HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the     Content-Type response headers of applications hosted or proxied by the server can split the HTTP response.

    This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did     not address the issue.

    Users are recommended to upgrade to version 2.4.64, which fixes this issue. (CVE-2024-42516)

    SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a     URL controlled by the attacker.  Requires an unlikely configuration where mod_headers is configured to     modify the Content-Type request or response header with a value provided in the HTTP request.

    Users are recommended to upgrade to version 2.4.64 which fixes this issue. (CVE-2024-43204)

    Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an     untrusted SSL/TLS client to insert escape characters into log files in some configurations.

    In a logging configuration where CustomLog is used with %{varname}x or %{varname}c to log variables     provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and     unsanitized data provided by the client may appear in log files. (CVE-2024-47252)

    In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by     trusted clients is possible using TLS 1.3 session resumption.

    Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to     a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path     setting). In such a case, a client trusted to access one virtual host may be able to access another     virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host. (CVE-2025-23048)

    In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26     through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2.

    Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost     set to on. (CVE-2025-49630)

    In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation     attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.

    Only configurations using SSLEngine optional to enable TLS upgrades are affected. Users are recommended     to upgrade to version 2.4.64, which removes support for TLS upgrade. (CVE-2025-49812)

    Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server.

    This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63.

    Users are recommended to upgrade to version 2.4.64, which fixes the issue. (CVE-2025-53020)

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 httpd installed on the remote host is prior to 2.4.64-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2958 advisory.

    HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the     Content-Type response headers of applications hosted or proxied by the server can split the HTTP response.

    This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did     not address the issue.

    Users are recommended to upgrade to version 2.4.64, which fixes this issue. (CVE-2024-42516)

    SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a     URL controlled by the attacker.  Requires an unlikely configuration where mod_headers is configured to     modify the Content-Type request or response header with a value provided in the HTTP request.

    Users are recommended to upgrade to version 2.4.64 which fixes this issue. (CVE-2024-43204)

    Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an     untrusted SSL/TLS client to insert escape characters into log files in some configurations.

    In a logging configuration where CustomLog is used with %{varname}x or %{varname}c to log variables     provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and     unsanitized data provided by the client may appear in log files. (CVE-2024-47252)

    In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by     trusted clients is possible using TLS 1.3 session resumption.

    Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to     a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path     setting). In such a case, a client trusted to access one virtual host may be able to access another     virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host. (CVE-2025-23048)

    In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26     through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2.

    Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost     set to on. (CVE-2025-49630)

    In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation     attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.

    Only configurations using SSLEngine optional to enable TLS upgrades are affected. Users are recommended     to upgrade to version 2.4.64, which removes support for TLS upgrade. (CVE-2025-49812)

    Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server.

    This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63.

    Users are recommended to upgrade to version 2.4.64, which fixes the issue. (CVE-2025-53020)

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 SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02565-1 advisory.

    - CVE-2024-42516: Fixed HTTP response splitting. (bsc#1246477)
    - CVE-2024-43204: Fixed a SSRF when mod_proxy is loaded that allows an attacker to send outbound proxy     requests to a URL controlled by them. (bsc#1246305)
    - CVE-2024-47252: Fixed insufficient escaping of user-supplied data in mod_ssl allows an untrusted SSL/TLS     client to insert escape characters into log file. (bsc#1246303)
    - CVE-2025-23048: Fixed access control bypass by trusted clients through TLS 1.3 session resumption in     some mod_ssl configurations. (bsc#1246302)
    - CVE-2025-49630: Fixed denial of service can be triggered by untrusted clients causing an assertion in     mod_proxy_http2. (bsc#1246307)
    - CVE-2025-49812: Fixed Opossum Attack Application Layer Desynchronization using Opportunistic TLS.
    (bsc#1246169)
    - CVE-2025-53020: Fixed HTTP/2 denial of service due to late release of memory after effective lifetime.
    (bsc#1246306)

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 httpd installed on the remote host is prior to 2.4.65. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-204-01 advisory.

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

Tenable has extracted the preceding description block directly from the httpd 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 httpd installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-49812 advisory.

  - In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation     attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only     configurations using SSLEngine optional to enable TLS upgrades are affected. Users are recommended to     upgrade to version 2.4.64, which removes support for TLS upgrade. (CVE-2025-49812)

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

The version of httpd installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-49812 advisory.

  - In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation     attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only     configurations using SSLEngine optional to enable TLS upgrades are affected. Users are recommended to     upgrade to version 2.4.64, which removes support for TLS upgrade. (CVE-2025-49812)

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

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.64. It is, therefore, affected by multiple vulnerabilities:

 - HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the Content-Type response headers of applications hosted or proxied by the server can split the HTTP response. (CVE-2024-42516)

 - Server-Side Request Forgery (SSRF) in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a URL controlled by the attacker. (CVE-2024-43204)

 - Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via mod_rewrite or apache expressions that pass unvalidated request input. (CVE-2024-43394)

 - Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. (CVE-2024-47252)

 - In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.62, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. (CVE-2025-23048)

 - In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. (CVE-2025-49630)

 - In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. (CVE-2025-49812)

 - Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. (CVE-2025-53020) Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7639-1 advisory.

    It was discovered that the Apache HTTP Server incorrectly handled certain Content-Type response headers. A     remote attacker could possibly use this issue to perform HTTP response splitting attacks. (CVE-2024-42516)

    xiaojunjie discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests. A     remote attacker could possibly use this issue to send outbound proxy requests to an arbitrary URL.
    (CVE-2024-43204)

    John Runyon discovered that the Apache HTTP Server mod_ssl module incorrectly escaped certain data. A     remote attacker could possibly use this issue to insert escape characters into log files. (CVE-2024-47252)

    Sven Hebrok, Felix Cramer, Tim Storm, Maximilian Radoy, and Juraj Somorovsky discovered that the Apache     HTTP Server mod_ssl module incorrectly handled TLS 1.3 session resumption. A remote attacker could     possibly use this issue to bypass access control. (CVE-2025-23048)

    Anthony CORSIEZ discovered that the Apache HTTP Server mod_proxy_http2 module incorrectly handled missing     host headers. A remote attacker could possibly use this issue to cause the server to crash, resulting in a     denial of service. (CVE-2025-49630)

    Robert Merget discovered that the Apache HTTP Server mod_ssl module incorrectly handled TLS upgrades. A     remote attacker could possibly use this issue to hijack an HTTP session. This update removes the old     SSLEngine optional configuration option, possibly requiring a configuration change in certain     environments. (CVE-2025-49812)

    Gal Bar Nahum discovered that the Apache HTTP Server incorrectly handled certain memory operations. A     remote attacker could possibly use this issue to cause the server to consume resources, leading to a     denial of service. (CVE-2025-53020)

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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 342f2a0a-5e9b-11f0-8baa-8447094a420f advisory.

    The Apache httpd project reports:
    moderate: Apache HTTP Server: HTTP response splitting (CVE-2024-42516)     low: Apache HTTP Server: SSRF with mod_headers setting Content-Type header (CVE-2024-43204)     moderate: Apache HTTP Server: SSRF on Windows due to UNC paths (CVE-2024-43394)     low: Apache HTTP Server: mod_ssl error log variable escaping (CVE-2024-47252)     moderate: Apache HTTP Server: mod_ssl access control bypass with session resumption (CVE-2025-23048)     low: Apache HTTP Server: mod_proxy_http2 denial of service (CVE-2025-49630)     moderate: Apache HTTP Server: mod_ssl TLS upgrade attack (CVE-2025-49812)     moderate: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)

Tenable has extracted the preceding description block directly from the FreeBSD 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 httpd installed on the remote host is prior to 2.4.64. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-192-02 advisory.

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

Tenable has extracted the preceding description block directly from the httpd 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 Apache httpd installed on the remote host is prior to 2.4.64. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.64 advisory.

  - In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26     through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2.
    Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost     set to on. (CVE-2025-49630)

  - HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the     Content-Type response headers of applications hosted or proxied by the server can split the HTTP response.
    This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did     not address the issue. Users are recommended to upgrade to version 2.4.64, which fixes this issue.
    (CVE-2024-42516)

  - SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a     URL controlled by the attacker. Requires an unlikely configuration where mod_headers is configured to     modify the Content-Type request or response header with a value provided in the HTTP request. Users are     recommended to upgrade to version 2.4.64 which fixes this issue. (CVE-2024-43204)

  - Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes     to a malicious server via mod_rewrite or apache expressions that pass unvalidated request input. This     issue affects Apache HTTP Server: from 2.4.0 through 2.4.63. Note: The Apache HTTP Server Project will be     setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths. The server offers     limited protection against administrators directing the server to open UNC paths. Windows servers should     limit the hosts they will connect over via SMB based on the nature of NTLM authentication.
    (CVE-2024-43394)

  - Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an     untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging     configuration where CustomLog is used with %{varname}x or %{varname}c to log variables provided by     mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized     data provided by the client may appear in log files. (CVE-2024-47252)

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
243544	SUSE SLES15 Security Update : apache2 (SUSE-SU-2025:02683-1)	Nessus	SuSE Local Security Checks	critical
243541	SUSE SLES15 Security Update : apache2 (SUSE-SU-2025:02682-1)	Nessus	SuSE Local Security Checks	critical
243531	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : apache2 (SUSE-SU-2025:02684-1)	Nessus	SuSE Local Security Checks	critical
243522	SUSE SLED15 / SLES15 Security Update : apache2 (SUSE-SU-2025:02685-1)	Nessus	SuSE Local Security Checks	critical
243478	Amazon Linux 2023 : httpd, httpd-core, httpd-devel (ALAS2023-2025-1125)	Nessus	Amazon Linux Local Security Checks	critical
243429	Amazon Linux 2 : httpd (ALAS-2025-2958)	Nessus	Amazon Linux Local Security Checks	critical
243268	SUSE SLES12 Security Update : apache2 (SUSE-SU-2025:02565-1)	Nessus	SuSE Local Security Checks	critical
242640	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2025-204-01)	Nessus	Slackware Local Security Checks	critical
242400	CBL Mariner 2.0 Security Update: httpd (CVE-2025-49812)	Nessus	MarinerOS Local Security Checks	high
242383	Azure Linux 3.0 Security Update: httpd (CVE-2025-49812)	Nessus	Azure Linux Local Security Checks	high
114917	Apache 2.4.x < 2.4.64 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
242284	Ubuntu 22.04 LTS / 24.04 LTS / 25.04 : Apache HTTP Server vulnerabilities (USN-7639-1)	Nessus	Ubuntu Local Security Checks	critical
242028	FreeBSD : Apache httpd -- Multiple vulnerabilities (342f2a0a-5e9b-11f0-8baa-8447094a420f)	Nessus	FreeBSD Local Security Checks	high
242008	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2025-192-02)	Nessus	Slackware Local Security Checks	high
241984	Apache 2.4.x < 2.4.64 Multiple Vulnerabilities	Nessus	Web Servers	high

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