Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.

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 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-ed25a8b170 advisory.

    civetweb 1.16

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 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-7ddaa1e0bd advisory.

    civetweb 1.16, rhbz#2391892

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.

  - Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to     achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request     processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or     arbitrary code execution. (CVE-2025-55763)

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
264592	Fedora 41 : civetweb (2025-ed25a8b170)	Nessus	Fedora Local Security Checks	Local	high
264584	Fedora 42 : civetweb (2025-7ddaa1e0bd)	Nessus	Fedora Local Security Checks	Local	high
260738	Linux Distros Unpatched Vulnerability : CVE-2025-55763	Nessus	Misc.	Local	high

Detections

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CVE-2025-55763

high

Tenable Plugins

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high

high

high