Vulnerability · Published Dec 5, 2025 · Assigned by apache
CVE-2025-66200Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo
Medium 5.4
In plain English
A medium-severity authentication bypass in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.7%top 46.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | httpd | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:9 | httpd-core | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | httpd-devel | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:10 | httpd-filesystem | 2.4.63-4.el10_1.3 | ALSA-2025:23932 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | httpd-filesystem | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | httpd-manual | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | httpd-tools | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4 | ALSA-2025:23732 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | mod_ldap | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:9 | mod_lua | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 | ALSA-2025:23732 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | mod_proxy_html | 1:2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | mod_session | 2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7 | ALSA-2025:23732 |
| AlmaLinux:9 | mod_ssl | 1:2.4.62-7.el9_7.3 | ALSA-2025:23919 |
| Alpine:v3.20 | apache2 | 2.4.66-r0 | ALPINE-CVE-2025-66200 |
| Alpine:v3.21 | apache2 | 2.4.66-r0 | ALPINE-CVE-2025-66200 |
| Alpine:v3.22 | apache2 | 2.4.66-r0 | ALPINE-CVE-2025-66200 |
| Alpine:v3.23 | apache2 | 2.4.66-r0 | ALPINE-CVE-2025-66200 |
| Alpine:v3.24 | apache2 | 2.4.66-r0 | ALPINE-CVE-2025-66200 |
| Debian:12 | apache2 | 2.4.66-1~deb12u1 | DEBIAN-CVE-2025-66200 |
| Debian:13 | apache2 | 2.4.66-1~deb13u1 | DEBIAN-CVE-2025-66200 |
| Debian:14 | apache2 | 2.4.66-1 | DEBIAN-CVE-2025-66200 |
| Rocky Linux:10 | httpd | 0:2.4.63-4.el10_1.3 | RLSA-2025:23932 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1938+3b7755d4.3 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40045+6ce8579b.6 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1842+4a9649e8.2 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1840+b070a976.1 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+2061+8d03fdec.5 | RLSA-2025:23732 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1984+1bed3124.4 | RLSA-2025:23732 |
| Rocky Linux:9 | httpd | 0:2.4.62-7.el9_7.3 | RLSA-2025:23919 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2025:23732 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1883+38ed6c58.1 | RLSA-2025:23732 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1938+3b7755d4.3 | RLSA-2025:23732 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1830+22f0c9e0 | RLSA-2025:23732 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+2061+8d03fdec.4 | RLSA-2025:23732 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2025:23732 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.18 | USN-7968-1 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.18 | UBUNTU-CVE-2025-66200 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.10 | USN-7968-1 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.10 | UBUNTU-CVE-2025-66200 |
| Ubuntu:25.10 | apache2 | 2.4.64-1ubuntu3.2 | UBUNTU-CVE-2025-66200 |
| Ubuntu:25.10 | apache2 | 2.4.64-1ubuntu3.2 | USN-7968-1 |
| Ubuntu:26.04:LTS | apache2 | 2.4.66-2ubuntu1 | UBUNTU-CVE-2025-66200 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.7 – through 2.4.65 |
Weakness: CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L