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CISA KEV · ACTIVELY EXPLOITED
MEDIUM severity

CVE-2022-41091 — Windows 10 20h2

MEDIUM

CVE-2022-41091 is a medium-severity (CVSS 5.4) CWE-863 vulnerability in microsoft windows 10 20h2. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-11-08) and has been used in ransomware campaigns — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Windows Mark of the Web Security Feature Bypass Vulnerability

Published
Updated
Affected
12 products
Patched
See advisory
Exploits
2 known
Exploitation data as of Oct 21, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-11-08 — including use in ransomware campaigns. Federal agencies were required to remediate by 2022-12-09.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2022-41091.

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk+0.10%
Lower risk than most CVEs80th percentile — riskier than 80% of all scored CVEsHighest risk
0.08%3.15%6.23%9.31%7.6%1.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2022-41091 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Windows Mark of the Web Security Feature Bypass Vulnerability

Affected Products

12 products · 12 configurations
OS
windows 10 20h2microsoft
< 10.0.19042.2251
range
OS
windows 10 21h1microsoft
< 10.0.19043.2251
range
OS
windows 10 21h2microsoft
< 10.0.19044.2251
range
OS
windows 10 22h2microsoft
< 10.0.19045.2251
range
OS
windows 10 1507microsoft
< 10.0.10240.19567
range
OS
windows 10 1607microsoft
< 10.0.14393.5501
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Windows Mark of the Web Security Feature Bypass Vulnerability

portal.msrc.microsoft.comMSNov 2022

Windows Mark of the Web Security Feature Bypass Vulnerability

cisa.govCISANov 2022

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every microsoft windows 10 20h2 deployment and check each version against the affected-products list above.

  2. Fix

    Apply the microsoft windows 10 20h2 security patch or hotfix for CVE-2022-41091 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Windows Mark of the Web Security Feature Bypass Vulnerability
O3 Security · Runtime Protection

Is CVE-2022-41091 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
CVE-2022-41091: Windows 10 20h2 (Medium 5.4, KEV)