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CRITICAL

CVE-2023-25690

CVSS v3

9.8

CRITICAL

EPSS Score

84.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apacheBitnamifrom 2.4.0 · fixed in 2.4.56
  • httpdAlmaLinux:9all versions · fixed in 2.4.53-7.el9_1.5and 8 other packages
  • httpdAlmaLinux:8all versions · fixed in 2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5and 6 other packages
  • mod_http2AlmaLinux:9all versions · fixed in 1.15.19-3.el9_1.5
  • mod_http2AlmaLinux:8all versions · fixed in 1.15.7-5.module_el8.7.0+3515+9e4fe0d6.4
  • mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.6.0+3031+fb177b09
  • mod_sslAlmaLinux:9all versions · fixed in 1:2.4.53-7.el9_1.5and 1 other package
  • mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-51.module_el8.7.0+3515+9e4fe0d6.5and 1 other package

Vendor advisories

  • CVE-2023-25690 Red Hat Product Security693 products fixed · 1 known affected

    httpd: HTTP request splitting with mod_rewrite and mod_proxy

    httpd22 as a component of Red Hat JBoss Enterprise Application Platform 6

  • ICSA-25-105-08 CISA2 known affected

    ABB M2M Gateway

    ABB M2M Gateway ARM600, firmware versions = 4.1.2 <= 5.0.3 · ABB M2M Gateway SW, software versions = 5.0.1 <= 5.0.3

  • ICSA-25-133-01 CISA1 product fixed · 1 known affected

    Hitachi Energy Service Suite

    Hitachi Energy Service Suite versions 9.8.1.3 and below

  • ICSA-26-027-02 CISA1 known affected

    Festo Didactic SE MES PC

    Festo Didactic SE MES PC shipped with Windows 10

  • ICSA-24-046-11 CISA11 known affected

    Siemens SCALANCE XCM-/XRM-300

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2)

  • ICSA-24-046-15 CISA1 known affected

    Siemens SINEC NMS

    SINEC NMS

13 more advisories

Full record on NVD

Description

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.

Technical details

Published
2023-03-07

Frequently asked questions

What is CVE-2023-25690?

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.

Is CVE-2023-25690 actively exploited?

Active exploitation of CVE-2023-25690 has not been confirmed. Its EPSS score was 84.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-25690?

CVE-2023-25690 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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