CVE-2025-54309
CrushFTP Unprotected Alternate Channel Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 12 August 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 93.47% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 22 July 2025 · due 12 August 2025
- Weakness
- CWE-420
- Affected
- crushftp/crushftp
- Source
- cve@mitre.org
EPSS moved from 93.5% on 19 October 2026 to 93.5% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025 ; https://nvd.nist.gov/vuln/detail/CVE-2025-54309
References
- https://www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/Press/Media Coverage
- https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025Vendor Advisory
- https://www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild/Press/Media Coverage
- https://www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerabilityThird Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerabilityThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-54309US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.