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CISA KEV · ACTIVELY EXPLOITED
CRITICAL severity

CVE-2025-54309 — Crushftp

CRITICAL

CVE-2025-54309 is a critical-severity (CVSS 9) CWE-420 vulnerability in crushftp crushftp. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-07-22) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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
Updated
Affected
1 product
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-07-22. Federal agencies were required to remediate by 2025-08-12.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-54309.

EPSS Exploitation Probability

via FIRST.org ↗
93.5%probability of exploitation in next 30 days
Very High Risk-1.43%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
67.7%78.5%89.2%100.0%74.0%93.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2025-54309 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

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
1

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

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every crushftp crushftp deployment and check each version against the affected-products list above.

  2. Fix

    Apply the crushftp crushftp security patch or hotfix for CVE-2025-54309 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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.
O3 Security · Runtime Protection

Is CVE-2025-54309 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
Actively Exploited: CVE-2025-54309: Crushftp (Critical 9)