CVE-2025-54309

Q: How do I fix CVE-2025-54309?

Upgrade crushftp to 11.3.4_23 or later.

Q: Is CVE-2025-54309 being actively exploited?

Yes. CVE-2025-54309 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2025-08-12. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2025-54309?

CVE-2025-54309 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-54309 affect?

Published advisories record a fix for crushftp (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 100th pctl

9.0

CVSS v3

NVD

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.

CWE-420

How to fix

Remediation Available

crushftpNVD

Affected:>= 11.0.0, < 11.3.4_23Fixed in:11.3.4_23CVE-2025-54309derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

94.36%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

CrushFTP Unprotected Alternate Channel Vulnerability

CrushFTP contains an unprotected alternate channel vulnerability. When the DMZ proxy feature is not used, mishandles AS2 validation and consequently allows remote attackers to obtain admin access via HTTPS.

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

Remediation due: 2025-08-12

References

Vendor Advisory1

crushftp.com

Third-Party Advisory2

Government Resource1

cisa.gov

Press / Media2

Related Vulnerabilities

Other CWE-420 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-20198	Critical	10.0	100%	KEV	Fix
CVE-2024-10081	Critical	10.0	39%	-	Fix
CVE-2025-13315	Critical	9.8	33%	-	-
CVE-2024-6242	Unscored	-	9.2%	-	-
CVE-2025-53967	High	8.0	7.4%	-	-
CVE-2026-40217	High	8.8	6.5%	-	Fix

Common questions

How do I fix CVE-2025-54309?

Upgrade crushftp to 11.3.4_23 or later.

Is CVE-2025-54309 being actively exploited?

Yes. CVE-2025-54309 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2025-08-12. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2025-54309?

CVE-2025-54309 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-54309 affect?

Published advisories record a fix for crushftp (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2025-54309

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-05.