synced 9 MIN AGO
01 Record

CVE-2023-25690

Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

CriticalPUBLISHEDCNA: apache
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
View raw JSON

02 Description

Apache HTTP Server: HTTP request splitting with mod_rewrite and mod_proxy

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
84.50% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 99.6% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-03-07 15:09Z3 YR AGO
Last updated
2025-12-18 15:37Z10 MO AGO
Reserved
2023-02-12
Assigning CNA
apache
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base
  • CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant
Data version
5.2
Document digest
6f640e4b7223cab51bd49eb9bae61baa4f206901978fe994f47150fd39e20df0

05 Affected products

VendorProductVersionsPlatforms
Apache Software FoundationApache HTTP Server2.4.0 to 2.4.55—

06 References

07 Fixed in

AlmaLinux 8

  • httpd
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-devel
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-filesystem
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-manual
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-tools
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_http2
    Fixed in 1.15.7-5.module_el8.7.0+3515+9e4fe0d6.4
  • mod_ldap
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
    • Affected before 1:2.0.8-8.module_el8.6.0+3031+fb177b09
  • mod_proxy_html
    Fixed in 1:2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_session
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_ssl
    Fixed in 1:2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • httpd
    Fixed in 2.4.53-7.el9_1.5
  • httpd-core
    Fixed in 2.4.53-7.el9_1.5
  • httpd-devel
    Fixed in 2.4.53-7.el9_1.5
  • httpd-filesystem
    Fixed in 2.4.53-7.el9_1.5
  • httpd-manual
    Fixed in 2.4.53-7.el9_1.5
  • httpd-tools
    Fixed in 2.4.53-7.el9_1.5
  • mod_http2
    Fixed in 1.15.19-3.el9_1.5
  • mod_ldap
    Fixed in 2.4.53-7.el9_1.5
  • mod_lua
    Fixed in 2.4.53-7.el9_1.5
  • mod_proxy_html
    Fixed in 1:2.4.53-7.el9_1.5
  • mod_session
    Fixed in 2.4.53-7.el9_1.5
  • mod_ssl
    Fixed in 1:2.4.53-7.el9_1.5

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • httpd
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-devel
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-filesystem
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-manual
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • httpd-tools
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_http2
    Fixed in 1.15.7-5.module_el8.7.0+3515+9e4fe0d6.4
  • mod_ldap
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
    • Affected before 1:2.0.8-8.module_el8.6.0+3031+fb177b09
  • mod_proxy_html
    Fixed in 1:2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_session
    Fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5
  • mod_ssl
    Fixed in 1:2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • httpd
    Fixed in 2.4.53-7.el9_1.5
  • httpd-core
    Fixed in 2.4.53-7.el9_1.5
  • httpd-devel
    Fixed in 2.4.53-7.el9_1.5
  • httpd-filesystem
    Fixed in 2.4.53-7.el9_1.5
  • httpd-manual
    Fixed in 2.4.53-7.el9_1.5
  • httpd-tools
    Fixed in 2.4.53-7.el9_1.5
  • mod_http2
    Fixed in 1.15.19-3.el9_1.5
  • mod_ldap
    Fixed in 2.4.53-7.el9_1.5
  • mod_lua
    Fixed in 2.4.53-7.el9_1.5
  • mod_proxy_html
    Fixed in 1:2.4.53-7.el9_1.5
  • mod_session
    Fixed in 2.4.53-7.el9_1.5
  • mod_ssl
    Fixed in 1:2.4.53-7.el9_1.5

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • apache2
    Fixed in 2.4.29-1ubuntu4.27

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • apache2
    Fixed in 2.4.41-4ubuntu3.14

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • apache2
    Fixed in 2.4.52-1ubuntu4.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • apache2
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • apache2
    Fixed in 2.4.18-2ubuntu3.17+esm10
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.