# CVE-2025-31161: CrushFTP Authentication Bypass Vulnerability

> CVE-2025-31161: CrushFTP Authentication Bypass Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2025-31161
Last updated: 2026-06-17T09:09:56Z

- Published: 2025-04-03 00:00 UTC · Updated: 2026-06-17 09:09 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2025-04-07, federal due date 2025-04-28, ransomware use: Known
- CWE: CWE-305

## Description

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, 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. This will authenticate the session through the HMAC verification process and up until the server checks for user verification once more. The vulnerability can be further stabilized, eliminating the need for successfully triggering a race condition, by sending a mangled AWS4-HMAC header. By providing only the username and a following slash (/), the server will successfully find a username, which triggers the successful anypass authentication process, but the server will fail to find the expected SignedHeaders entry, resulting in an index-out-of-bounds error that stops the code from reaching the session cleanup. Together, these issues make it trivial to authenticate as any known or guessable user (e.g., crushadmin), and can lead to a full compromise of the system by obtaining an administrative account.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- CrushFTP: CrushFTP

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-31161)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-31161)
- [https://crushftp.com/crush11wiki/Wiki.jsp?page=Update\#section-Update-VulnerabilityInfo](https://crushftp.com/crush11wiki/Wiki.jsp?page=Update#section-Update-VulnerabilityInfo)
- [https://outpost24.com/blog/crushftp-auth-bypass-vulnerability/](https://outpost24.com/blog/crushftp-auth-bypass-vulnerability/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-31161 · Markdown: https://rewindex.com/cve/CVE-2025-31161.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-31161 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:05:41.588Z