CVE-2025-54309 — CrushFTP Unprotected Alternate Channel Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2025-54309
- Vulnerability
- CrushFTP Unprotected Alternate Channel Vulnerability
- Vendor
- CrushFTP
- Affected products
- CrushFTP: CrushFTP
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- Published
- 2025-07-22
Remediation guidance
CVE-2025-54309 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for CrushFTP the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2025-54309 — and stay ahead of the next one
CVE-2025-54309 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2025-54309 and other CrushFTP issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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