# CVE-2025-54309: CrushFTP unprotected alternate channel in AS2 validation

Source: https://junglewise.ai/threats/cve-2025-54309-crushftp-unprotected-alternate-channel-in-as2-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-22. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2025-54309 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2025-07-22

CrushFTP, a popular enterprise file transfer solution, contains a critical vulnerability that allows unauthorized individuals to gain full administrative control over the server. This flaw is particularly dangerous because it can be exploited remotely over the internet without any prior login credentials. Attackers can use this access to steal sensitive files, modify data, or disrupt business operations. This vulnerability has been actively exploited in the wild.

Technologies: [CrushFTP](https://junglewise.ai/threats/technologies/crushftp). Vendors: [CrushFTP](https://junglewise.ai/threats/vendors/crushftp).

## Quick answers

**Is CVE-2025-54309 exploited in the wild?** Yes. CVE-2025-54309 is known to be exploited in the wild, first recorded on 22 July 2025. Treat it as urgent.

**How severe is CVE-2025-54309?** Critical severity, with a CVSS score of 9.8, published 22 July 2025.

**Which products and versions are affected?** CrushFTP 10 before 10.8.5, 11 before 11.3.4_23.

**Is there a fix for CVE-2025-54309?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-54309 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-54309?** Check whether you run CrushFTP 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.

## Technical details

CrushFTP versions 10 (prior to 10.8.5) and 11 (prior to 11.3.4_23) are vulnerable to an unprotected alternate channel (CWE-420) flaw. The vulnerability exists in the mishandling of AS2 (Applicability Statement 2) validation when the DMZ proxy feature is not in use. A remote, unauthenticated attacker can exploit this over HTTPS to bypass security controls and gain full administrative privileges. This vulnerability was identified as a zero-day and has been observed in active exploitation. Users are advised to upgrade to the latest patched versions or implement the vendor-recommended DMZ proxy configuration as a mitigation.

## Affected products

- CrushFTP CrushFTP 10 before 10.8.5, 11 before 11.3.4_23

## Timeline

- 2025-07-18: disclosed: Initial CVE entry and vendor advisory published
- 2025-07-22: kev added: Added to CISA Known Exploited Vulnerabilities catalog
- 2025-07-22: advisory: NVD publication date
- 2025-07-22: exploited: Confirmed active exploitation in the wild

## Related threats

- [CrushFTP cross-site request forgery in web management interface](https://junglewise.ai/threats/cve-2015-20129-crushftp-before-7-3-0-contains-a-cross-site-request-forgery)
- [Cross Site Scripting (XSS) vulnerability in CrushFTP 11.3.6_48. The Web-Based Server has a feature where users can…](https://junglewise.ai/threats/cve-2025-63419-cross-site-scripting-xss-vulnerability-in-crushftp-11-3-6-48-the)
- [CrushFTP Authentication Bypass Vulnerability](https://junglewise.ai/threats/cve-2025-31161-crushftp-authentication-bypass-vulnerability)
- [CrushFTP VFS Sandbox Escape Vulnerability](https://junglewise.ai/threats/cve-2024-4040-crushftp-vfs-sandbox-escape-vulnerability)