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 allow…

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

1. 2025-07-18 Published
2. 2025-07-22 Added to CISA KEV
3. 2025-08-12 CISA patch deadline
4. 2025-08-15 CISA SSVC: exploitation active

Added

15 mo ago (2025-07-22)

Patch by

2025-08-12 (14 mo ago)

Ransomware

Not known

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor, product

CrushFTP, CrushFTP

CISA name

CrushFTP Unprotected Alternate Channel Vulnerability

How it is exploited and what it leads to, in MITRE ATT&CK terms.

• T1068 Exploitation for Privilege Escalation exploitation
• T1567 Exfiltration Over Web Service primary impact
• T1021 Remote Services secondary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

Exploitation

Active, exploited in the wild

Automatable

no

Technical impact

total

Assessed

14 mo ago (2025-08-15)

93.47% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

• CrushFTP CrushFTP

Weakness

• CWE-420 Unprotected Alternate Channel

• crushftp.com /crush11wiki/Wiki.jsp?page=CompromiseJuly2025

  vendor-advisory

• rapid7.com /blog/post/crushftp-zero-day-exploited-in-the-wild/

  press/media-coverage

• bleepingcomputer.com /news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/

  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?field_cve=CVE-2025-54309

  government-resource, us-government-resource

• CVE List CVE-2025-54309
• NVD CVE-2025-54309

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.