FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by a vulnerability as referenced in the USN-7486-1 advisory.

    It was discovered that FastCGI incorrectly handled certain inputs. An attacker could possibly use this     issue to cause a crash or execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu 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 version of fcgi 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-2025-23016 advisory.

  - FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer     overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in     fcgiapp.c. (CVE-2025-23016)

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 fcgi 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-2025-23016 advisory.

  - FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer     overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in     fcgiapp.c. (CVE-2025-23016)

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 5f868a5f-2943-11f0-bb22-f02f7432cf97 advisory.

    cve@mitre.org reports:
    FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer             overflow (and resultant heap-based buffer overflow) via             crafted nameLen or valueLen values in data to the IPC socket.
            This occurs in ReadParams in fcgiapp.c.

Tenable has extracted the preceding description block directly from the FreeBSD 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.

  - FastCGI fcgi2 (aka fcgi) 2.x through 2.4.4 has an integer overflow (and resultant heap-based buffer     overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in     fcgiapp.c. (CVE-2025-23016)

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

ID	Name	Product	Family	Severity
235342	Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : FastCGI vulnerability (USN-7486-1)	Nessus	Ubuntu Local Security Checks	critical
235315	Azure Linux 3.0 Security Update: fcgi (CVE-2025-23016)	Nessus	Azure Linux Local Security Checks	critical
235278	CBL Mariner 2.0 Security Update: fcgi (CVE-2025-23016)	Nessus	MarinerOS Local Security Checks	critical
235147	FreeBSD : fcgi -- Heap-based buffer overflow via crafted nameLen/valueLen in ReadParams (5f868a5f-2943-11f0-bb22-f02f7432cf97)	Nessus	FreeBSD Local Security Checks	critical
231333	Linux Distros Unpatched Vulnerability : CVE-2025-23016	Nessus	Misc.	critical

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CVE-2025-23016

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Tenable Plugins

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