Known exploited vulnerability
CVE-2025-54309
The short answer
CVE-2025-54309 affects CrushFTP CrushFTP and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-07-22: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-420.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Jul 22, 2025
Federal due date Aug 12, 2025
EPSS, next 30 days
93%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
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 products
CrushFTP. NVD's record lists the exact affected versions.
References
- www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/ Press/Media Coverage
- www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025 Vendor Advisory
- www.rapid7.com/blog/post/crushftp-zero-day-exploited-in-the-wild/ Press/Media Coverage
- www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerability Third Party Advisory
- www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerability Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-54309 US Government Resource
Questions
Is CVE-2025-54309 being exploited?
Yes. CISA added CVE-2025-54309 to its Known Exploited Vulnerabilities catalog on 2025-07-22, with a federal remediation due date of 2025-08-12.
How do I fix CVE-2025-54309?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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