CVE-2025-66200: Apache HTTP Server

Medium severity, CVSS 5.4. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Apache HTTP Server: from 2.4.7, before 2.4.66 (fixed in 2.4.66)

Published 2025-12-05. Last modified 2026-06-17.