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Exploited vulnerability · CISA KEV

Is CVE-2024-40766 exploited? Yes: in CISA KEV since 9 Sep 2024

Gociux · SonicWall SonicOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-40766, SonicWall SonicOS Improper Access Control Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 9 Sep 2024, 17 days after it was published. It is known to be used in ransomware campaigns. It affects SonicWall SonicOS, an internet-facing product of the kind attackers use for initial access. 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 · 9 Sep 2024
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity9.3CVSS 3.1 · critical
US federal due30 Sep 2024BOD 22-01 deadline

What it is

SonicWall SonicOS contains an improper access control vulnerability that could lead to unauthorized resource access and, under certain conditions, may cause the firewall to crash.

VendorSonicWall (20 exploited CVEs in KEV)
ProductSonicOS
VulnerabilitySonicWall SonicOS Improper Access Control Vulnerability
WeaknessCWE-284
Published23 Aug 2024
Added to KEV9 Sep 2024
Reported by (CNA)sonicwall

What to do

  1. Check whether you run it. Look for SonicOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited SonicWall 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 23 Aug 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for SonicWall.

Other exploited CVEs in SonicOS

References

Questions

Is CVE-2024-40766 being exploited?

Yes. CISA added CVE-2024-40766 to the Known Exploited Vulnerabilities catalog on 9 Sep 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-40766 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2024-40766?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check SonicWall's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SonicOS 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 September 2024 · SonicWall scorecard · act-now radar.

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