A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8749-1 advisory.

    It was discovered that CivetWeb did not correctly handle parsing certain URIs. A remote attacker could     possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected     Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2025-55763)

    It was discovered that CivetWeb did not correctly handle parsing certain HTTP requests. A remote attacker     could possibly use this issue to cause a denial of service. (CVE-2025-9648)

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 a vulnerability as referenced in the FEDORA-2025-1056ea31ed advisory.

    civetweb-1.16, rhbz#240016

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

Note that Nessus has not tested for this issue 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 a vulnerability as referenced in the FEDORA-2025-247b5416b4 advisory.

    civetweb-1.16, rhbz#2400165

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

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

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

  - A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to     trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a     null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious     requests will result in complete CPU exhaustion and render the service unresponsive to further requests.
    This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-     built by vendor is not affected. (CVE-2025-9648)

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

ID	Name	Product	Family	Type	Severity
345734	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS : CivetWeb vulnerabilities (USN-8749-1)	Nessus	Ubuntu Local Security Checks	Local	high
269693	Fedora 42 : civetweb (2025-1056ea31ed)	Nessus	Fedora Local Security Checks	Local	high
269687	Fedora 41 : civetweb (2025-247b5416b4)	Nessus	Fedora Local Security Checks	Local	high
266288	Linux Distros Unpatched Vulnerability : CVE-2025-9648	Nessus	Misc.	Local	high

Detections

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CVE-2025-9648

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Tenable Plugins

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high

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