CVE-2025-54309: CrushFTP Unprotected Alternate Channel Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 22 Jul 2025, 4 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 93.5%
EPSS score, percentile 99.8 of all scored records
- How severe?
- 9.0 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA 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.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 10 to before 10.8.5
- from 11 to before 11.3.4_23
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 12 August 2025.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025
- https://nvd.nist.gov/vuln/detail/CVE-2025-54309
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 10 to before 10.8.5 |
| Affected | from 11 to before 11.3.4_23 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2025-54309 to its Known Exploited Vulnerabilities (KEV) catalog on 22 Jul 2025.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 12 Aug 2025.
- The CVE record was published on 18 Jul 2025, 4 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.0 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 93.5% (percentile 99.8), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-420: Unprotected Alternate Channel
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 18 Jul 2025 | CVE record published |
| 22 Jul 2025 | Added to CISA KEV |
| 12 Aug 2025 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited CrushFTP vulnerabilities
- CVE-2025-31161: CrushFTP Authentication Bypass Vulnerability
- CVE-2024-4040: CrushFTP VFS Sandbox Escape Vulnerability