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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : FastCGI vulnerability (USN-9051-1)

critical Nessus Plugin ID 381366

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-9051-1 advisory.

 It was discovered that FastCGI incorrectly handled certain parameter lengths, leading to an integer overflow and a heap-based buffer overflow. An attacker could possibly use this issue to cause applications using FastCGI to crash, resulting in a denial of service, 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.

Solution

Update the affected libfcgi-bin and / or libfcgi0ldbl packages.

See Also

https://ubuntu.com/security/notices/USN-9051-1

Plugin Details

Severity: Critical

ID: 381366

File Name: ubuntu_USN-9051-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/14/2026

Updated: 11/14/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.59

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2025-23016

CVSS v3

Risk Factor: Critical

Base Score: 9.3

Temporal Score: 8.1

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libfcgi-bin, p-cpe:/a:canonical:ubuntu_linux:libfcgi0ldbl

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 11/11/2026

Vulnerability Publication Date: 1/10/2025

Reference Information

CVE: CVE-2025-23016

USN: 9051-1