CVE-2026-63045

Analyzed Analyzed - Analysis Complete

Improper FTP PASV Reply Validation in Apache HTTP Server

Publication date: 2026-10-01

Last updated on: 2026-10-05

Assigner: Apache Software Foundation

Description

Improper validation of FTP PASV reply address in mod_proxy_ftp in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows, in forward proxy configurations, an untrusted FTP server to cause the proxy to open a data connection to an arbitrary third-party host via a crafted PASV response. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

CVSS Scores

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Meta Information

Published

2026-10-01

Last Modified

2026-10-05

Generated

2026-10-19

AI Q&A

2026-10-01

EPSS Evaluated

2026-10-18

NVD

CVE-2026-63045

EUVD

EUVD-2026-90901

Affected Vendors & Products

Vendor	Product	Version / Range
apache	http_server	From 2.4.0 (inc) to 2.4.69 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper validation of FTP PASV reply addresses in Apache HTTP Server's mod_proxy_ftp module. When used as a forward proxy, a malicious FTP server can trick the proxy into connecting to an arbitrary host by sending a crafted PASV response.

Detection Guidance

To detect this vulnerability, check if your Apache HTTP Server version is 2.4.68 or earlier. Use the command: httpd -v. If the version is 2.4.68 or below, the system is vulnerable.

Impact Analysis

If you use Apache HTTP Server as a forward proxy with FTP support, an attacker could exploit this to make your server initiate connections to unintended third-party systems. This could lead to data exfiltration, unauthorized access, or network reconnaissance.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized data transfers or network access. GDPR may consider this a breach if personal data is exposed, while HIPAA could view it as a security incident affecting protected health information.

Mitigation Strategies

Upgrade Apache HTTP Server to version 2.4.69 or later immediately. Follow your distribution's update process or download the latest version from the official Apache website.

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