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Exploited vulnerability · CISA KEV

Is CVE-2022-41091 exploited? Yes: in CISA KEV since 8 Nov 2022

Gociux · Microsoft Windows · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2022-41091, Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 8 Nov 2022. It is known to be used in ransomware campaigns. It affects Microsoft Windows. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 8 Nov 2022
ransomwareKnownused in campaigns
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity5.4CVSS 3.1 · medium
US federal due9 Dec 2022BOD 22-01 deadline

What it is

Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWindows
VulnerabilityMicrosoft Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability
WeaknessCWE-863
Published9 Nov 2022
Added to KEV8 Nov 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Windows in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 9 Nov 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

References

Questions

Is CVE-2022-41091 being exploited?

Yes. CISA added CVE-2022-41091 to the Known Exploited Vulnerabilities catalog on 8 Nov 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-41091 used in ransomware attacks?

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

How do I fix CVE-2022-41091?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows 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 November 2022 · Microsoft scorecard · act-now radar.

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