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Fencer Vulns
medium 5.4

CVE-2025-66200 json

Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo

published 2025-12-05 11 mo ago modified 2026-10-18 21 d ago also BIT-apache-2025-66200 , EUVD-2025-201403

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami apache 2.4.66
  • apache2 Debian 12 2.4.66-1~deb12u1
  • apache2 Debian 13 2.4.66-1~deb13u1
  • apache2 Debian 14 2.4.66-1

debian advisories DEBIAN-CVE-2025-66200

  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.18
  • apache2 Ubuntu 24.04 LTS 2.4.58-1ubuntu8.10
  • apache2 Ubuntu 25.10 2.4.64-1ubuntu3.2
  • apache2 Ubuntu 26.04 LTS 2.4.66-2ubuntu1
  • apache2 Ubuntu Pro 14.04 LTS 2.4.7-1ubuntu4.22+esm12
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm17
  • apache2 Ubuntu Pro 18.04 LTS 2.4.29-1ubuntu4.27+esm7
  • apache2 Ubuntu Pro 20.04 LTS 2.4.41-4ubuntu3.23+esm3

ubuntu advisories UBUNTU-CVE-2025-66200

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd hummingbird 1 2.4.66-6.hum1
  • httpd-core hummingbird 1 2.4.66-6.hum1
  • httpd-tools hummingbird 1 2.4.66-6.hum1
  • httpd-manual hummingbird 1 2.4.66-6.hum1
  • httpd-filesystem hummingbird 1 2.4.66-6.hum1
  • jbcs-httpd24-curl jboss core services 1 8.11.0-4.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.62-11.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.62-11.el8jbcs

red hat advisories RHSA-2026:5156RHSA-2026:2994RHSA-2025:23932RHSA-2025:23919RHSA-2025:23732

  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
  • apache2 SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2-event SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2-utils SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2-manual SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2-worker SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2-prefork SLES for SAP applications 16.0, SLES 16.0 2.4.63-160000.3.1
  • apache2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 2.4.58-150600.5.41.1

suse advisories SUSE-SU-2026:2686-1SUSE-SU-2026:20081-1SUSE-SU-2026:0020-1SUSE-SU-2026:0019-1SUSE-SU-2025:4518-1SUSE-SU-2025:4488-1

  • apache2 openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2-event openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2-utils openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2-manual openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2-worker openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2-prefork openSUSE Leap 16.0 2.4.63-160000.3.1
  • apache2 openSUSE Tumbleweed 2.4.66-1.1

opensuse advisories openSUSE-SU-2026:20030-1openSUSE-SU-2025:15808-1

  • httpd AlmaLinux 8 2.4.37-65.module_el8.10.0+4088+57f011c1.7
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
  • mod_ssl AlmaLinux 8 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7
  • mod_ldap AlmaLinux 8 2.4.37-65.module_el8.10.0+4088+57f011c1.7
  • mod_http2 AlmaLinux 8 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4
  • httpd-tools AlmaLinux 8 2.4.37-65.module_el8.10.0+4088+57f011c1.7
  • mod_session AlmaLinux 8 2.4.37-65.module_el8.10.0+4088+57f011c1.7
  • httpd-manual AlmaLinux 8 2.4.37-65.module_el8.10.0+4088+57f011c1.7

almalinux advisories ALSA-2025:23732ALSA-2025:23919ALSA-2025:23932

  • httpd Rocky Linux 10 2.4.63-4.el10_1.3
  • httpd Rocky Linux 9 2.4.62-7.el9_7.3
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+40045+6ce8579b.6
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1830+22f0c9e0
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1842+4a9649e8.2
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1938+3b7755d4.3
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1840+b070a976.1
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+2061+8d03fdec.5

rocky linux advisories RLSA-2025:23932RLSA-2025:23919RLSA-2025:23732

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.4.66-r0

alpine advisories ALPINE-CVE-2025-66200

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd CBL-Mariner 2.0, Azure Linux 3.0 2.4.66-1

azure linux advisories AZL-71528AZL-71590

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-66200 updated cvss 5.4

httpd: Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Core Services httpd
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.10.0+23815+1b5e1c66.2, httpd 2.4.37-65.module+el8.10.0+23815+1b5e1c66.7, mod_ssl 2.4.37-65.module+el8.10.0+23815+1b5e1c66.7, mod_ldap 2.4.37-65.module+el8.10.0+23815+1b5e1c66.7, mod_http2 1.15.7-10.module+el8.10.0+23369+11a81384.4, httpd-tools 2.4.37-65.module+el8.10.0+23815+1b5e1c66.7, +4 more
    fixed: vendor fix RHSA-2025:23732
  • Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.62-7.el9_7.3, mod_lua 2.4.62-7.el9_7.3, mod_ssl 2.4.62-7.el9_7.3, mod_ldap 2.4.62-7.el9_7.3, httpd-core 2.4.62-7.el9_7.3, httpd-tools 2.4.62-7.el9_7.3, +4 more
    fixed: vendor fix RHSA-2025:23919
  • Red Hat Enterprise Linux AppStream (v. 10) httpd 2.4.63-4.el10_1.3, mod_lua 2.4.63-4.el10_1.3, mod_ssl 2.4.63-4.el10_1.3, mod_ldap 2.4.63-4.el10_1.3, httpd-core 2.4.63-4.el10_1.3, httpd-tools 2.4.63-4.el10_1.3, +4 more
    fixed: vendor fix RHSA-2025:23932
  • Red Hat Hardened Images httpd 2.4.66-6.hum1, httpd-core 2.4.66-6.hum1, httpd-tools 2.4.66-6.hum1, httpd-manual 2.4.66-6.hum1, httpd-filesystem 2.4.66-6.hum1
    fixed: vendor fix RHSA-2026:5156
  • Red Hat JBoss Core Services 2.4.62.SP3
    fixed: vendor fix RHSA-2026:2995
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.62-11.el7jbcs, jbcs-httpd24-mod_ssl 2.4.62-11.el7jbcs, jbcs-httpd24-mod_ldap 2.4.62-11.el7jbcs, jbcs-httpd24-httpd-tools 2.4.62-11.el7jbcs, jbcs-httpd24-mod_session 2.4.62-11.el7jbcs, jbcs-httpd24-httpd-manual 2.4.62-11.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.62-11.el8jbcs, jbcs-httpd24-mod_ssl 2.4.62-11.el8jbcs, jbcs-httpd24-mod_ldap 2.4.62-11.el8jbcs, jbcs-httpd24-httpd-tools 2.4.62-11.el8jbcs, jbcs-httpd24-mod_session 2.4.62-11.el8jbcs, jbcs-httpd24-httpd-manual 2.4.62-11.el8jbcs, +2 more
    fixed: vendor fix RHSA-2026:2994
show 1 more
  • Red Hat Hardened Images mod_lua 2.4.66-6.hum1, mod_ssl 2.4.66-6.hum1, mod_ldap 2.4.66-6.hum1, mod_session 2.4.66-6.hum1, mod_proxy_html 2.4.66-6.hum1 Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.11.0-4.el7jbcs, jbcs-httpd24-apr-util 1.6.3-4.el7jbcs, jbcs-httpd24-libcurl 8.11.0-4.el7jbcs, jbcs-httpd24-mod_md 2.4.28-13.el7jbcs, jbcs-httpd24-openssl 1.1.1k-21.el7jbcs, jbcs-httpd24-mod_http2 2.0.29-8.el7jbcs, +15 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-apr-util 1.6.3-4.el8jbcs, jbcs-httpd24-mod_md 2.4.28-13.el8jbcs, jbcs-httpd24-mod_http2 2.0.29-8.el8jbcs, jbcs-httpd24-apr-util-nss 1.6.3-4.el8jbcs, jbcs-httpd24-apr-util-ldap 1.6.3-4.el8jbcs, jbcs-httpd24-apr-util-odbc 1.6.3-4.el8jbcs, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.7, <2.4.66
2.4.66

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.