How severe is CVE-2025-54309?

CVE-2025-54309 has a CVSS score of 9/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-54309?

Affected package information for CVE-2025-54309 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-54309?

No fixed version has been published for CVE-2025-54309 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-54309 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2025-54309, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2025-54309?

CVE-2025-54309 has an EPSS (Exploit Prediction Scoring System) score of 76.8%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2025-54309 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-54309 ( CrushFTP Unprotected Alternate Channel Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-07-22. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-08-12. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-54309?

CVE-2025-54309 is classified as CWE-420 (CWE-420). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2025-54309?

CVE-2025-54309 affects crushftp crushftp. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2025-54309 published, and has it been updated?

CVE-2025-54309 was published on July 18, 2025 and was last updated on November 5, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-07-22 — agencies required to remediate by 2025-08-12

CVE-2025-54309

CRITICAL

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…

Published

Jul 18, 2025

Updated

Nov 5, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

76.8%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

1 product · 2 configurations

Application

crushftpcrushftp

≥ 11.0.0 && < 11.3.4_23

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

watchtowrlabs/watchTowr-vs-CrushFTP-Authentication-Bypass-CVE-2025-54309

⭐ 28🍴 3Apr 2026

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2025-54309 in your stack?

O3 detects CVE-2025-54309 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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