Vulnerability in Apache HTTP Server
CVE-2025-66200
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.006 (49.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Apache HTTP Server
- Apache Software Foundation HTTP Server — versions 2.4.7
Weakness classification (CWE)
References
- httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Issue Tracking, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-66200?
- CVE-2025-66200 is a medium-severity vulnerability in Apache HTTP Server, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 5.4/10. Published 2025-12-05.
- How severe is CVE-2025-66200?
- Medium severity. CVSS v3 base score is 5.4 out of 10.