What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-05 · updated 2026-09-25
• Weakness: CWE-150

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.

Affected products

• Apache HTTP Server: from 2.4.0 before 2.4.66 — fixed in 2.4.66

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.66. Check the vendor advisory for mitigations.

References

• https://httpd.apache.org/security/vulnerabilities_24.html
• http://www.openwall.com/lists/oss-security/2025/12/04/7

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