CVE-2025-66200

Publication date 5 December 2025

Last updated 19 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid. This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	25.10 questing	Fixed 2.4.64-1ubuntu3.2
	25.04 plucky	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.4.58-1ubuntu8.10
	22.04 LTS jammy	Fixed 2.4.52-1ubuntu4.18
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: 4dcf39a

Severity score breakdown

Parameter	Value
Base score	5.4 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-7968-1
Apache HTTP Server vulnerabilities
19 January 2026