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Exploited vulnerability · CISA KEV

Is CVE-2024-4040 exploited? Yes: in CISA KEV since 24 Apr 2024

Gociux · CrushFTP · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-4040, CrushFTP VFS Sandbox Escape Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 24 Apr 2024, 2 days after it was published. It affects CrushFTP. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 24 Apr 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due1 May 2024BOD 22-01 deadline

What it is

CrushFTP contains an unspecified sandbox escape vulnerability that allows a remote attacker to escape the CrushFTP virtual file system (VFS).

VendorCrushFTP (3 exploited CVEs in KEV)
ProductCrushFTP
VulnerabilityCrushFTP VFS Sandbox Escape Vulnerability
WeaknessCWE-1336
Published22 Apr 2024
Added to KEV24 Apr 2024
Reported by (CNA)directcyber

What to do

  1. Check whether you run it. Look for CrushFTP in your asset inventory, including appliances and cloud images. Stack check lists every exploited CrushFTP CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Apr 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for CrushFTP.

Other exploited CVEs in CrushFTP

References

Questions

Is CVE-2024-4040 being exploited?

Yes. CISA added CVE-2024-4040 to the Known Exploited Vulnerabilities catalog on 24 Apr 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-4040 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-4040?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check CrushFTP's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected CrushFTP and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2024 · CrushFTP scorecard · act-now radar.

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