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TI-2023-10967 Aliases CVE-2023-25690GHSA-wc6r-9c75-44gq

Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

Priority CRITICAL 90CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 20 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.84508 99th percentileScored 2026-11-07
Fix Partial Red Hat: 11 advisoriesRed Hat: 20 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache HTTP Server2.4.0 – 2.4.55—No fix listedCNA
  • Apache HTTP Server VendorApache Affected 2.4.0 – 2.4.55 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*2.4.0 – 2.4.55VulnerableApache
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.4.0 – 2.4.55 Vulnerable ·Apache

Remediation

Red Hat 11 advisories

  • RHSA-2023:3354 Released 2023-06-05 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 security update
    • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr-util-1.6.1-101.el7jbcs, jbcs-httpd24-apr-util-devel-1.6.1-101.el7jbcs, jbcs-httpd24-apr-util-ldap-1.6.1-101.el7jbcs +23
    • Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-apr-util-1.6.1-101.el8jbcs, jbcs-httpd24-apr-util-devel-1.6.1-101.el8jbcs, jbcs-httpd24-apr-util-ldap-1.6.1-101.el8jbcs +23
  • RHSA-2023:3355 Released 2023-06-05 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 security update
    • JBCS httpd 2.4.51.sp2
  • RHSA-2023:3292 Released 2023-05-24 · Red Hat rating Important
    httpd24-httpd security update
    • Red Hat Software Collections for RHEL Workstation(v. 7) httpd24-httpd-2.4.34-23.el7.6, httpd24-httpd-devel-2.4.34-23.el7.6, httpd24-httpd-manual-2.4.34-23.el7.6 +5
    • Red Hat Software Collections for RHEL(v. 7) httpd24-httpd-2.4.34-23.el7.6, httpd24-httpd-devel-2.4.34-23.el7.6, httpd24-httpd-manual-2.4.34-23.el7.6 +5
Show 8 more Red Hat advisories
  • RHSA-2023:1916 Released 2023-04-20 · Red Hat rating Important
    httpd and mod_http2 security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) httpd-2.4.51-7.el9_0.4, httpd-devel-2.4.51-7.el9_0.4, httpd-filesystem-2.4.51-7.el9_0.4 +8
  • RHSA-2023:1672 Released 2023-04-06 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.src::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.x86_64::httpd:2.4, httpd-devel-2.4.37-21.module+el8.2.0+18510+68528e70.6.x86_64::httpd:2.4 +11
    • Red Hat Enterprise Linux AppStream E4S (v. 8.2) httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.ppc64le::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.src::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.x86_64::httpd:2.4 +20
    • Red Hat Enterprise Linux AppStream TUS (v. 8.2) httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.src::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+18510+68528e70.6.x86_64::httpd:2.4, httpd-devel-2.4.37-21.module+el8.2.0+18510+68528e70.6.x86_64::httpd:2.4 +11
  • RHSA-2023:1673 Released 2023-04-06 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream (v. 8) httpd-2.4.37-51.module+el8.7.0+18499+2e106f0b.5.aarch64::httpd:2.4, httpd-2.4.37-51.module+el8.7.0+18499+2e106f0b.5.ppc64le::httpd:2.4, httpd-2.4.37-51.module+el8.7.0+18499+2e106f0b.5.s390x::httpd:2.4 +38
  • RHSA-2023:1670 Released 2023-04-06 · Red Hat rating Important
    httpd and mod_http2 security update
    • Red Hat Enterprise Linux AppStream (v. 9) httpd-2.4.53-7.el9_1.5, httpd-core-2.4.53-7.el9_1.5, httpd-devel-2.4.53-7.el9_1.5 +9
  • RHSA-2023:1597 Released 2023-04-04 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) httpd-2.4.37-47.module+el8.6.0+18507+843660a1.4.aarch64::httpd:2.4, httpd-2.4.37-47.module+el8.6.0+18507+843660a1.4.ppc64le::httpd:2.4, httpd-2.4.37-47.module+el8.6.0+18507+843660a1.4.s390x::httpd:2.4 +38
  • RHSA-2023:1593 Released 2023-04-04 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Client Optional (v. 7) httpd-2.4.6-98.el7_9.7, httpd-devel-2.4.6-98.el7_9.7, httpd-manual-2.4.6-98.el7_9.7 +5
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd-2.4.6-98.el7_9.7, httpd-devel-2.4.6-98.el7_9.7, httpd-manual-2.4.6-98.el7_9.7 +5
    • Red Hat Enterprise Linux Server (v. 7) httpd-2.4.6-98.el7_9.7, httpd-devel-2.4.6-98.el7_9.7, httpd-manual-2.4.6-98.el7_9.7 +3
    • Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap-2.4.6-98.el7_9.7, mod_proxy_html-1:2.4.6-98.el7_9.7
    • Red Hat Enterprise Linux Workstation (v. 7) httpd-2.4.6-98.el7_9.7, httpd-devel-2.4.6-98.el7_9.7, httpd-manual-2.4.6-98.el7_9.7 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap-2.4.6-98.el7_9.7, mod_proxy_html-1:2.4.6-98.el7_9.7
  • RHSA-2023:1596 Released 2023-04-04 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) httpd-2.4.37-39.module+el8.4.0+18509+78723510.6.aarch64::httpd:2.4, httpd-2.4.37-39.module+el8.4.0+18509+78723510.6.ppc64le::httpd:2.4, httpd-2.4.37-39.module+el8.4.0+18509+78723510.6.s390x::httpd:2.4 +38
  • RHSA-2023:1547 Released 2023-04-03 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) httpd-2.4.37-16.module+el8.1.0+18511+ffefe478.6.ppc64le::httpd:2.4, httpd-2.4.37-16.module+el8.1.0+18511+ffefe478.6.src::httpd:2.4, httpd-2.4.37-16.module+el8.1.0+18511+ffefe478.6.x86_64::httpd:2.4 +19

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat JBoss Enterprise Application Platform 6AffectedNo fix planned: Out of support scope
JBCS httpd 2.4.51.sp2Fixed RHSA-2023:3355
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:1673
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:1670
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2023:1672
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2023:1547
Red Hat Enterprise Linux AppStream E4S (v. 8.2)Fixed RHSA-2023:1672
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2023:1596
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2023:1597
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:1916
Red Hat Enterprise Linux AppStream TUS (v. 8.2)Fixed RHSA-2023:1672
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2023:1593
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2023:1593
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2023:1593
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2023:1593
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2023:1593
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2023:1593
Red Hat JBoss Core Services on RHEL 7 ServerFixed RHSA-2023:3354
Red Hat JBoss Core Services on RHEL 8Fixed RHSA-2023:3354
Red Hat Software Collections for RHEL Workstation(v. 7)Fixed RHSA-2023:3292
Red Hat Software Collections for RHEL(v. 7)Fixed RHSA-2023:3292
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat JBoss Core Services on RHEL 7 Server
  • Red Hat JBoss Core Services on RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-25690
  2. 2026-10-03 Alias added: GHSA-wc6r-9c75-44gq
  3. 2026-10-09 Fix available: RHSA-2023:3355 · Red Hat
  4. 2026-10-09 Fix available: JBCS httpd 2.4.51.sp2 · Red Hat

References

Advisory 1

Other 3

  • TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
  • TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 349 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences