What’s Vulnerable › Vulnerabilities

CVE-2025-54309: CrushFTP Unprotected Alternate Channel Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-07-22
• EPSS: 93.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-18 · updated 2026-06-17
• Weakness: CWE-420

Description

CrushFTP 10 before 10.8.5 and 11 before 11.3.4_23, when the DMZ proxy feature is not used, mishandles AS2 validation and consequently allows remote attackers to obtain admin access via HTTPS, as exploited in the wild in July 2025.

Affected products

• CrushFTP: from 10.0.0 before 10.8.5; from 11.0.0 before 11.3.4_23 — fixed in 10.8.5, 11.3.4_23

How to fix

Upgrade to a fixed version: CrushFTP 10.8.5, 11.3.4_23. Check the vendor advisory for mitigations.

References

• https://www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/
• https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025
• https://www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild/
• https://www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerability
• https://www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerability
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-54309

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