Improper authentication in CrushFTP - CVE-2025-54309
Published: July 21, 2025 / Updated: September 12, 2025
Vulnerability identifier: #VU113076
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-54309
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to improper input validation in AS2 file transfer protocol. A remote attacker can obtain the administrator's session and gain unauthorized access to the server.
Affected software
CrushFTP
How to mitigate CVE-2025-54309
Install updates from vendor's website.
CrushFTP - addressed in versions 10.8.5, 11.3.4
Links to Public Exploits and PoC-codes
- Exploit #11957 - CVE-2025-54309__Enhanced_exploit () (September 12, 2025)
- Exploit #11946 - CVE-2025-54309 (September 12, 2025)
- Exploit #11897 - CVE-2025-54309-EXPLOIT (CrushFTP Unauthenticated Remote Command Execution Exploit) (August 29, 2025)
- Exploit #11887 - CVE-2025-54309 (August 29, 2025)
- Exploit #11886 - watchTowr-vs-CrushFTP-Authentication-Bypass-CVE-2025-54309 (August 29, 2025)
External References
- https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025#section-CompromiseJuly2025-CVE202554309
- https://www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/
- https://www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild/