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Linux Distros Unpatched Vulnerability : CVE-2025-49506

high Nessus Plugin ID 333187

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

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

 - APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue. (CVE-2025-49506)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2025-49506

https://ubuntu.com/security/CVE-2025-49506

Plugin Details

Severity: High

ID: 333187

File Name: unpatched_CVE_2025_49506.nasl

Version: 1.6

Type: Local

Agent: unix

Family: Misc.

Published: 8/7/2026

Updated: 8/16/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v2

Risk Factor: Low

Base Score: 1.9

Temporal Score: 1.6

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

CVSS Score Source: CVE-2025-49506

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:apr-util, p-cpe:/a:centos:centos:apr-util-bdb, p-cpe:/a:centos:centos:apr-util-devel, p-cpe:/a:centos:centos:apr-util-ldap, p-cpe:/a:centos:centos:apr-util-lmdb, p-cpe:/a:centos:centos:apr-util-mysql, p-cpe:/a:centos:centos:apr-util-nss, p-cpe:/a:centos:centos:apr-util-odbc, p-cpe:/a:centos:centos:apr-util-openssl, p-cpe:/a:centos:centos:apr-util-pgsql, p-cpe:/a:centos:centos:apr-util-sqlite, p-cpe:/a:centos:centos:apr-util, p-cpe:/a:redhat:enterprise_linux:apr-util-bdb, p-cpe:/a:redhat:enterprise_linux:apr-util-devel, p-cpe:/a:redhat:enterprise_linux:apr-util-ldap, p-cpe:/a:redhat:enterprise_linux:apr-util-lmdb, p-cpe:/a:redhat:enterprise_linux:apr-util-mysql, p-cpe:/a:redhat:enterprise_linux:apr-util-nss, p-cpe:/a:redhat:enterprise_linux:apr-util-odbc, p-cpe:/a:redhat:enterprise_linux:apr-util-openssl, p-cpe:/a:redhat:enterprise_linux:apr-util-pgsql, p-cpe:/a:redhat:enterprise_linux:apr-util-sqlite, p-cpe:/a:redhat:enterprise_linux:apr-util

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/6/2026

Reference Information

CVE: CVE-2025-49506