# CVE-2026-63045: Apache HTTP Server FTP PASV reply validation bypass in mod_proxy_ftp

Source: https://junglewise.ai/threats/cve-2026-63045-improper-validation-of-ftp-pasv-reply-address-in-mod-proxy-ftp-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-63045 · Severity: high · CVSS 7.5 · Published 2026-10-01

Apache HTTP Server's FTP proxy module (mod_proxy_ftp) improperly validates server responses when configured as a forward proxy, allowing an attacker-controlled FTP server to trick the proxy into connecting to arbitrary third-party hosts. This could lead to internal network reconnaissance, port scanning, or data exfiltration from systems the proxy can reach but an attacker cannot.

Technologies: [Apache HTTP Server](https://junglewise.ai/threats/technologies/http-server), [Apache Software Foundation HTTP Server](https://junglewise.ai/threats/technologies/apache-software-foundation-http-server). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache), [Apache Software Foundation](https://junglewise.ai/threats/vendors/apache-software-foundation).

## Quick answers

**Is CVE-2026-63045 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63045 being exploited in the wild.

**How severe is CVE-2026-63045?** High severity, with a CVSS score of 7.5, published 1 October 2026.

**Which products and versions are affected?** Apache Software Foundation HTTP Server 2.4.0 through 2.4.68.

**Is there a fix for CVE-2026-63045?** Yes: fixed in 2.4.69. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63045 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-63045?** Check whether you run Apache HTTP Server or Apache Software Foundation HTTP Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 2.4.69

## Technical details

An improper validation flaw in mod_proxy_ftp's handling of FTP PASV (Passive Mode) replies allows an untrusted FTP server to inject a crafted response that causes the proxy to open a data connection to an arbitrary host. The vulnerability requires the proxy to be configured in forward proxy mode and an attacker to control the upstream FTP server. This enables connection smuggling and potential access to internal systems.

## Affected products

- Apache Software Foundation HTTP Server 2.4.0 through 2.4.68

## Timeline

- 2026-07-07: disclosed: Report received
- 2026-10-01: patched: Fixed in r1938674; version 2.4.69 released

## References

- [https://httpd.apache.org/security/vulnerabilities_24.html](https://httpd.apache.org/security/vulnerabilities_24.html)
- [http://www.openwall.com/lists/oss-security/2026/10/01/23](http://www.openwall.com/lists/oss-security/2026/10/01/23)

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