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CVE

CVE-2025-54309

CrushFTP Unprotected Alternate Channel Vulnerability

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.

CRITICAL · CVSS 9 ⚠ CISA KEV EPSS 0.768
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

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

⬡

Weakness Classification

CWE-420Unprotected Alternate Channel
▤

Affected Products & Versions

2
crushftp>= 10.0.0 and < 10.8.5
crushftp>= 11.0.0 and < 11.3.4_23
◈

Detection Rules (IDS/IPS)

2
et-openET WEB_SPECIFIC_APPS CrushFTP WebInterface Alternative Channel Authentication Bypass (CVE-2025-54309) M2attempted-admin
et-openET WEB_SPECIFIC_APPS CrushFTP WebInterface Alternative Channel Authentication Bypass (CVE-2025-54309) M1attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Jul 2025 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2025-54309
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/Press/Media Coverage
https://www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild/Press/Media Coverage
https://www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerabilityThird Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerabilityThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-54309US Government Resource
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