CVE-2025-54309

critical

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.

From the Tenable Blog

CVE-2025-54309: CrushFTP Zero-Day Vulnerability Exploited In The Wild

Published: 2025-07-19

A critical zero-day flaw in CrushFTP that can grant attackers administrator access was discovered on July 18 and is under active exploitation.

References

https://www.vicarius.io/vsociety/posts/cve-2025-54309-mitigate-crushftp-vulnerability

https://www.vicarius.io/vsociety/posts/cve-2025-54309-detect-crushftp-vulnerability

https://hackread.com/hackers-exploit-crushftp-zero-day-take-over-servers/

https://securityaffairs.com/180293/hacking/u-s-cisa-adds-crushftp-google-chromium-and-sysaid-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2025/07/22/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://securityaffairs.com/180244/hacking/crushftp-zero-day-actively-exploited-at-least-since-july-18.html

https://www.securityweek.com/exploited-crushftp-zero-day-provides-admin-access-to-servers/

https://www.infosecurity-magazine.com/news/crushftp-critical-vulnerability/

https://www.helpnetsecurity.com/2025/07/21/crushftp-cve-2025-54309-vulnerability-exploited/

https://www.databreachtoday.com/hackers-target-zero-day-vulnerability-to-exploit-crushftp-a-29020

https://www.bleepingcomputer.com/news/security/over-1-000-crushftp-servers-exposed-to-ongoing-hijack-attacks/

https://thehackernews.com/2025/07/hackers-exploit-critical-crushftp-flaw.html

https://www.bleepingcomputer.com/news/security/new-crushftp-zero-day-exploited-in-attacks-to-hijack-servers/

https://www.bleepingcomputer.com/news/security/crushftp-zero-day-exploited-in-attacks-to-gain-admin-access-on-servers/

https://www.tenable.com/blog/cve-2025-54309-crushftp-zero-day-vulnerability-exploited-in-the-wild

https://github.com/smadonkuan/CVE-LAb

https://github.com/0xLittleSpidy/CVE-2025-54309

https://github.com/blueisbeautiful/CVE-2025-54309

https://github.com/rlawlwhs/CVEDictionary

https://www.crushftp.com/crush11wiki/Wiki.jsp?page=CompromiseJuly2025

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-54309

Details

Source: Mitre, NVD

Published: 2025-07-18

Updated: 2025-11-05

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.94905

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics