Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U H H H 9.8 .9998 100.0 YES
AFFECTED Product Versions Fixed CrushFTP 10 – —
TIMELINE Mar 27 Reserved by mitre Apr 3 Published (CNA: mitre) Apr 7 Added to CISA KEV, remediation due 2025-04-28
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.
| Date | Event | Detail |
|---|---|---|
| March 27, 2025 | Reserved | Reserved by mitre |
| April 3, 2025 | Published | Published (CNA: mitre) |
| April 7, 2025 | KEV ADDED | Added to CISA KEV, remediation due 2025-04-28 |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| CrushFTP | CrushFTP | — | 10 | — |
Authoritative record: CVE-2025-31161 at cve.org
Vendors: crushftp
Weaknesses: CWE-305
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-31161 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
