# CVE-2025-31161: CrushFTP Authentication Bypass Vulnerability

Source: https://junglewise.ai/threats/cve-2025-31161-crushftp-authentication-bypass-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-04-07. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2025-31161 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2025-04-07

CrushFTP contains an authentication bypass vulnerability in its AWS4-HMAC authorization method. A race condition and a subsequent header parsing error allow unauthenticated attackers to bypass authentication for any known user account, potentially leading to full system compromise.

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

## Quick answers

**Is CVE-2025-31161 exploited in the wild?** Yes. CVE-2025-31161 is known to be exploited in the wild, first recorded on 7 April 2025. Treat it as urgent.

**How severe is CVE-2025-31161?** Critical severity, with a CVSS score of 9.8, published 7 April 2025.

**Which products and versions are affected?** CrushFTP CrushFTP 10 before 10.8.4, 11 before 11.3.1.

**Is there a fix for CVE-2025-31161?** 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-2025-31161 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-31161?** Check whether you run CrushFTP. 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.

## Affected products

- CrushFTP CrushFTP 10 before 10.8.4, 11 before 11.3.1

## Timeline

- 2025-03: exploited: Exploitation observed in the wild.
- 2025-04-07: disclosed
- 2025-04-07: kev added: Added to CISA KEV catalog.

## 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 unprotected alternate channel in AS2 validation](https://junglewise.ai/threats/cve-2025-54309-crushftp-unprotected-alternate-channel-in-as2-validation)
- [CrushFTP VFS Sandbox Escape Vulnerability](https://junglewise.ai/threats/cve-2024-4040-crushftp-vfs-sandbox-escape-vulnerability)