CrushFTP Unprotected Alternate Channel Vulnerability

CRITICAL 9.8EXPLOITED (CISA KEV)CVE-2025-54309 · Published 18/07/2025 · updated 17/06/2026

CrushFTP Unprotected Alternate Channel Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 22/07/2025. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
crushftp crushftp	`≥ 10.0.0, < 10.8.5≥ 11.0.0, < 11.3.4_23`	`10.8.511.3.4_23`

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.

References

bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers · Press/Media Coverage
crushftp.com/crush11wiki/Wiki.jsp · Vendor Advisory
rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild · Press/Media Coverage
vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerability · Third Party Advisory
vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerability · Third Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2025-54309

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