CVE-2025-65082: Apache HTTP Server: CGI environment variable override

[Eric Covener <covener () apache org>]

Severity: low 

Affected versions:

- Apache HTTP Server 2.4.0 through 2.4.65

Description:

Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment 
variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs.

This issue affects Apache HTTP Server from 2.4.0 through 2.4.65.

Users are recommended to upgrade to version 2.4.66 which fixes the issue.

Credit:

Mattias Åsander (Umeå University) (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html`
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-65082

Timeline:

2025-11-14: reported
2025-12-01: fixed in 2.4.x by r1930167