CrushFTP - Authentication Bypass (CVE-2025-31161)
209Exploiting IPs reported
CrushFTP versions 10.0.0 through 10.8.3 and 11.0.0 through 11.3.0 are affected by a vulnerability that 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, aka "Unauthenticated HTTP(S) port access." A race condition exists in the AWS4-HMAC (compatible with S3) authorization method of the HTTP component of the FTP server. The server first verifies the existence of the user by performing a call to login_user_pass() with no password requirement.
CrowdSec analysis
CVE-2025-31161 is a critical vulnerability affecting CrushFTP that enables authentication bypass, potentially allowing attackers to take over administrative accounts without valid credentials.
CrowdSec has been tracking this vulnerability and its exploits since 7th of April 2025.
Data from the CrowdSec community indicates that exploitation of CVE-2025-31161 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2025-31161 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.
Exploit attempts are specifically directed towards URLs containing /webinterface/function/ along with certain user-related parameters.
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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