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Fencer Vulns
critical 9.8

CVE-2023-25690 in the critical feed json

Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

published 2023-03-07 3 y ago modified 2026-09-08 2 mo ago also BIT-apache-2023-25690 , EUVD-2023-29605

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
84.5%
EPSS 84.5% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known

Summary

Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.

Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like:

RewriteEngine on RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P] ProxyPassReverse /here/ http://example.com:8080/

Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server.

Patch / fix

  • bitnami apache 2.4.56
  • apache http_server 2.4.56
  • apache2 Debian 14, Debian 13, Debian 12 2.4.56-1

debian advisories DEBIAN-CVE-2023-25690

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.27
  • apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.14
  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.4
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm10

ubuntu advisories UBUNTU-CVE-2023-25690

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

  • jbcs-httpd24-curl jboss core services 1 8.0.1-1.el7jbcs
  • jbcs-httpd24-curl jboss core services 1 8.0.1-1.el8jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el8jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el7jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el8jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el7jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el8jbcs

red hat advisories RHSA-2023:3354RHSA-2023:3292RHSA-2023:1916RHSA-2023:1672RHSA-2023:1673RHSA-2023:1670

  • 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 SLE Module for Server Applications 15 SP4, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP4 +1 more 2.4.51-150400.6.11.1
  • apache2 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 2.4.51-150200.3.56.1
  • apache2 SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS +3 more 2.4.23-29.97.1
  • apache2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.51-35.25.1
  • apache2 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 2.4.33-150000.3.75.1

suse advisories SUSE-SU-2026:2686-1SUSE-SU-2023:1658-1SUSE-SU-2023:1573-1SUSE-SU-2023:0803-1SUSE-SU-2023:0799-1SUSE-SU-2023:0764-1

  • apache2 openSUSE Tumbleweed 2.4.56-1.1

opensuse advisories openSUSE-SU-2024:12776-1

  • httpd AlmaLinux 9 2.4.53-7.el9_1.5
  • mod_http2 AlmaLinux 9 1.15.19-3.el9_1.5
  • mod_lua AlmaLinux 9 2.4.53-7.el9_1.5
  • mod_ssl AlmaLinux 9 1:2.4.53-7.el9_1.5
  • mod_ldap AlmaLinux 9 2.4.53-7.el9_1.5
  • httpd-core AlmaLinux 9 2.4.53-7.el9_1.5
  • httpd-tools AlmaLinux 9 2.4.53-7.el9_1.5
  • mod_session AlmaLinux 9 2.4.53-7.el9_1.5

almalinux advisories ALSA-2023:1670ALSA-2023:1673

  • httpd Rocky Linux 9 2.4.53-7.el9_1.5
  • mod_http2 Rocky Linux 9 1.15.19-3.el9_1.5
  • httpd Rocky Linux 8 2.4.37-51.module+el8.7.0+1059+126e9251
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_http2 Rocky Linux 8 1.15.7-5.module+el8.6.0+823+f143cee1

rocky linux advisories RLSA-2023:1670RLSA-2023:1673

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.4.56-r0

alpine advisories ALPINE-CVE-2023-25690

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 2.4.56-1
  • mod_http2 Azure Linux 3.0 2.0.29-3

azure linux advisories AZL-25605AZL-45186

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-2023-25690 updated cvss 9.8

httpd: HTTP request splitting with mod_rewrite and mod_proxy

  • Red Hat JBoss Enterprise Application Platform 6 httpd22 httpd22
    affected: no fix planned “Out of support scope”
  • Red Hat JBCS httpd 2.4.51.sp2
    fixed: vendor fix RHSA-2023:3355
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-51.module+el8.7.0+18499+2e106f0b.5, mod_ssl 2.4.37-51.module+el8.7.0+18499+2e106f0b.5, mod_http2 1.15.7-5.module+el8.7.0+18499+2e106f0b.4, mod_ldap 2.4.37-51.module+el8.7.0+18499+2e106f0b.5, httpd-tools 2.4.37-51.module+el8.7.0+18499+2e106f0b.5, +4 more
    fixed: vendor fix RHSA-2023:1673
  • Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.53-7.el9_1.5, mod_lua 2.4.53-7.el9_1.5, mod_ssl 2.4.53-7.el9_1.5, mod_ldap 2.4.53-7.el9_1.5, httpd-core 2.4.53-7.el9_1.5, mod_http2 1.15.19-3.el9_1.5, +5 more
    fixed: vendor fix RHSA-2023:1670
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) mod_md 2.0.8-7.module+el8.2.0+5531+7e4d69a2, httpd 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_ssl 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_http2 1.11.3-3.module+el8.2.0+18513+b6a58d46.3, mod_ldap 2.4.37-21.module+el8.2.0+18510+68528e70.6, httpd-tools 2.4.37-21.module+el8.2.0+18510+68528e70.6, +4 more
    fixed: vendor fix RHSA-2023:1672
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) httpd 2.4.37-16.module+el8.1.0+18511+ffefe478.6, mod_md 2.4.37-16.module+el8.1.0+18511+ffefe478.6, mod_ssl 2.4.37-16.module+el8.1.0+18511+ffefe478.6, mod_http2 1.11.3-3.module+el8.1.0+18514+ae5f89d3.3, mod_ldap 2.4.37-16.module+el8.1.0+18511+ffefe478.6, httpd-tools 2.4.37-16.module+el8.1.0+18511+ffefe478.6, +4 more
    fixed: vendor fix RHSA-2023:1547
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) mod_md 2.0.8-7.module+el8.2.0+5531+7e4d69a2, httpd 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_ssl 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_http2 1.11.3-3.module+el8.2.0+18513+b6a58d46.3, mod_ldap 2.4.37-21.module+el8.2.0+18510+68528e70.6, httpd-tools 2.4.37-21.module+el8.2.0+18510+68528e70.6, +4 more
    fixed: vendor fix RHSA-2023:1672
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-39.module+el8.4.0+18509+78723510.6, mod_ssl 2.4.37-39.module+el8.4.0+18509+78723510.6, mod_http2 1.15.7-3.module+el8.4.0+18512+9c29e63a.2, mod_ldap 2.4.37-39.module+el8.4.0+18509+78723510.6, httpd-tools 2.4.37-39.module+el8.4.0+18509+78723510.6, +4 more
    fixed: vendor fix RHSA-2023:1596
show 7 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-47.module+el8.6.0+18507+843660a1.4, mod_ssl 2.4.37-47.module+el8.6.0+18507+843660a1.4, mod_http2 1.15.7-5.module+el8.6.0+18506+34b194fb.2, mod_ldap 2.4.37-47.module+el8.6.0+18507+843660a1.4, httpd-tools 2.4.37-47.module+el8.6.0+18507+843660a1.4, +4 more
    fixed: vendor fix RHSA-2023:1597
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) httpd 2.4.51-7.el9_0.4, mod_lua 2.4.51-7.el9_0.4, mod_ssl 2.4.51-7.el9_0.4, mod_ldap 2.4.51-7.el9_0.4, mod_http2 1.15.19-3.el9_0.5, httpd-tools 2.4.51-7.el9_0.4, +4 more
    fixed: vendor fix RHSA-2023:1916
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) mod_md 2.0.8-7.module+el8.2.0+5531+7e4d69a2, httpd 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_ssl 2.4.37-21.module+el8.2.0+18510+68528e70.6, mod_http2 1.11.3-3.module+el8.2.0+18513+b6a58d46.3, mod_ldap 2.4.37-21.module+el8.2.0+18510+68528e70.6, httpd-tools 2.4.37-21.module+el8.2.0+18510+68528e70.6, +4 more
    fixed: vendor fix RHSA-2023:1672
  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-98.el7_9.7, mod_ssl 2.4.6-98.el7_9.7, mod_ldap 2.4.6-98.el7_9.7, httpd-tools 2.4.6-98.el7_9.7, mod_session 2.4.6-98.el7_9.7, httpd-manual 2.4.6-98.el7_9.7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-98.el7_9.7, mod_ssl 2.4.6-98.el7_9.7, mod_ldap 2.4.6-98.el7_9.7, httpd-tools 2.4.6-98.el7_9.7, mod_session 2.4.6-98.el7_9.7, httpd-manual 2.4.6-98.el7_9.7, +1 more Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-98.el7_9.7, mod_ssl 2.4.6-98.el7_9.7, httpd-tools 2.4.6-98.el7_9.7, mod_session 2.4.6-98.el7_9.7, httpd-manual 2.4.6-98.el7_9.7 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-98.el7_9.7, mod_proxy_html 2.4.6-98.el7_9.7 Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-98.el7_9.7, mod_ssl 2.4.6-98.el7_9.7, httpd-tools 2.4.6-98.el7_9.7, mod_session 2.4.6-98.el7_9.7, httpd-manual 2.4.6-98.el7_9.7 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-98.el7_9.7, mod_proxy_html 2.4.6-98.el7_9.7
    fixed: vendor fix RHSA-2023:1593
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.51-39.el7jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el7jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el7jbcs, jbcs-httpd24-httpd-tools 2.4.51-39.el7jbcs, jbcs-httpd24-mod_session 2.4.51-39.el7jbcs, jbcs-httpd24-httpd-manual 2.4.51-39.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.51-39.el8jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el8jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el8jbcs, jbcs-httpd24-httpd-tools 2.4.51-39.el8jbcs, jbcs-httpd24-mod_session 2.4.51-39.el8jbcs, jbcs-httpd24-httpd-manual 2.4.51-39.el8jbcs, +2 more
    fixed: vendor fix RHSA-2023:3354
  • Red Hat Software Collections for RHEL Workstation(v. 7) httpd24-httpd 2.4.34-23.el7.6, httpd24-mod_ssl 2.4.34-23.el7.6, httpd24-mod_ldap 2.4.34-23.el7.6, httpd24-httpd-tools 2.4.34-23.el7.6, httpd24-mod_session 2.4.34-23.el7.6, httpd24-httpd-manual 2.4.34-23.el7.6, +1 more Red Hat Software Collections for RHEL(v. 7) httpd24-httpd 2.4.34-23.el7.6, httpd24-mod_ssl 2.4.34-23.el7.6, httpd24-mod_ldap 2.4.34-23.el7.6, httpd24-httpd-tools 2.4.34-23.el7.6, httpd24-mod_session 2.4.34-23.el7.6, httpd24-httpd-manual 2.4.34-23.el7.6, +1 more
    fixed: vendor fix RHSA-2023:3292
  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.0.1-1.el7jbcs, jbcs-httpd24-libcurl 8.0.1-1.el7jbcs, jbcs-httpd24-mod_md 2.4.0-20.el7jbcs, jbcs-httpd24-openssl 1.1.1k-14.el7jbcs, jbcs-httpd24-apr-util 1.6.1-101.el7jbcs, jbcs-httpd24-mod_http2 1.15.19-23.el7jbcs, +15 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.0.1-1.el8jbcs, jbcs-httpd24-libcurl 8.0.1-1.el8jbcs, jbcs-httpd24-mod_md 2.4.0-20.el8jbcs, jbcs-httpd24-openssl 1.1.1k-14.el8jbcs, jbcs-httpd24-apr-util 1.6.1-101.el8jbcs, jbcs-httpd24-mod_http2 1.15.19-23.el8jbcs, +15 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 ICSA-26-027-02 updated cvss 9.8

Festo Didactic SE MES PC

  • Festo Didactic SE MES PC shipped_with_Windows_10
    affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-105-08 updated cvss 8.8

ABB M2M Gateway

  • ABB M2M Gateway >=4.1.2, <=5.0.3, >=5.0.1, <=5.0.3
    affected: mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-133-01 updated cvss 9.8

Hitachi Energy Service Suite

  • Hitachi Energy Service Suite <=9.8.1.3
    affected: fixed in 9.8.1.4
  • Hitachi Energy Service Suite 9.8.1.4
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-046-11 updated cvss 9.8

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
10 mo ago

Exploit prediction

84.51% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.0, <2.4.56
2.4.56

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
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: Improve version ranges to indicate fix.