CrushFTP vulnerabilities

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.

CrushFTP 10 before 10.8.4 and 11 before 11.3.1 allows authentication bypass and takeover of the crushadmin account (unless a DMZ proxy instance is used), as exploited in the wild in March and April 2025. The vulnerability is a race condition in the AWS4-HMAC (S3-compatible) authorization method of the HTTP component. The server first verifies user existence via login_user_pass() without password, authenticating the session through HMAC verification. Sending a mangled AWS4-HMAC header stabilizes the attack, causing an index-out-of-bounds error that prevents session cleanup.