CVE-2025-54309

CrushFTP Unprotected Alternate Channel Vulnerability

n/a

CVSS

92.0%

EPSS (exploit prob.)

99.8%

EPSS percentile

Yes

Actively exploited

Ransomware use

2025-07-22

Added

MITRE ATT&CK techniques

How this vulnerability maps to adversary behaviour, from the Center for Threat-Informed Defense's public CVE→ATT&CK mappings. Use it to check whether your detections already cover the technique.

Technique	Name	Relationship
T1068	Exploitation for Privilege Escalation	exploitation technique
T1567	Exfiltration Over Web Service	primary impact
T1021	Remote Services	secondary impact

Summary

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.

Affected software

Vendor: CrushFTP · Product: CrushFTP

Weakness types (CWE):

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

Related vulnerabilities in CrushFTP

CVE	Name	EPSS	Exploited
CVE-2025-31161	CrushFTP Authentication Bypass Vulnerability	99.9%	Yes
CVE-2024-4040	CrushFTP VFS Sandbox Escape Vulnerability	99.5%	Yes

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