CrushFTP Unprotected Alternate Channel Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-07-22
• EPSS: 93% chance of exploitation in the next 30 days (higher than 100% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official 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.

CISA: CrushFTP contains an unprotected alternate channel vulnerability. When the DMZ proxy feature is not used, mishandles AS2 validation and consequently allows remote attackers to obtain admin access via HTTPS.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 12 Aug 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-a…Press/Media Coverage
• www.crushftp.com/crush11wiki/Wiki.jspVendor Advisory
• www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wildPress/Media Coverage
• www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerabilityThird Party Advisory
• www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerabilityThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource