# Windows 11 vulnerabilities > Windows 11 is made by Microsoft. We track 600 published vulnerabilities listed under that exact name, across 2 versions. 2 of them are on the list of flaws known to be exploited, the newest added on 6 October 2025. Microsoft lists newer releases under their own names, such as Windows 11 22H2, so check those pages too. Canonical page: https://www.precursorintelligence.com/product/microsoft/windows_11 ## At a glance - **Made by:** [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) - **Published vulnerabilities:** 600 - **Known to be exploited:** 2 (listed under the name Windows 11) - **Versions tracked:** 2 - **Most recently added to the known-exploited list:** [CVE-2021-43226](https://www.precursorintelligence.com/what-is/cve-2021-43226), 6 October 2025. We keep watching the list. ## Is Windows 11 listed under other names? Microsoft also lists Windows 11 under more specific names, such as Windows 11 22H2 and Windows 11 21H2. Flaws listed only under those names are counted on their own pages, not here. - [Windows 11 22H2](https://www.precursorintelligence.com/product/microsoft/windows_11_22h2): 1,473 published vulnerabilities - [Windows 11 21H2](https://www.precursorintelligence.com/product/microsoft/windows_11_21h2): 1,031 published vulnerabilities - [Windows 11 23H2](https://www.precursorintelligence.com/product/microsoft/windows_11_23h2): 991 published vulnerabilities - [Windows 11 24H2](https://www.precursorintelligence.com/product/microsoft/windows_11_24h2): 642 published vulnerabilities - [Windows 11 25H2](https://www.precursorintelligence.com/product/microsoft/windows_11_25h2): 108 published vulnerabilities ## Which versions of Windows 11 do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. - [CVE-2021-40449](https://www.precursorintelligence.com/what-is/cve-2021-40449) (Microsoft Windows Win32k Privilege Escalation Vulnerability): all versions 1 more exploited flaw names Windows 11 without a version of its own (for example as the system other affected software runs on). They are in the list below. ## Which Windows 11 vulnerabilities are being exploited? 2 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2021-43226](https://www.precursorintelligence.com/what-is/cve-2021-43226): Microsoft Windows Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 3.3%, known exploited since 6 October 2025. - [CVE-2021-40449](https://www.precursorintelligence.com/what-is/cve-2021-40449): Microsoft Windows Win32k Privilege Escalation Vulnerability. High, CVSS 7.8, chance of use in 30 days 74%, known exploited since 17 November 2021. ## Which Windows 11 flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2022-21907](https://www.precursorintelligence.com/what-is/cve-2022-21907): 93%, Critical (CVSS 9.8) - [CVE-2023-21758](https://www.precursorintelligence.com/what-is/cve-2023-21758): 93%, High (CVSS 7.5) - [CVE-2022-26809](https://www.precursorintelligence.com/what-is/cve-2022-26809): 91%, Critical (CVSS 9.8) - [CVE-2022-30216](https://www.precursorintelligence.com/what-is/cve-2022-30216): 89%, High (CVSS 8.8) - [CVE-2022-37958](https://www.precursorintelligence.com/what-is/cve-2022-37958): 86%, High (CVSS 8.1) - [CVE-2022-21972](https://www.precursorintelligence.com/what-is/cve-2022-21972): 79%, High (CVSS 8.1) - [CVE-2022-34721](https://www.precursorintelligence.com/what-is/cve-2022-34721): 76%, Critical (CVSS 9.8) - [CVE-2021-40449](https://www.precursorintelligence.com/what-is/cve-2021-40449): 74%, High (CVSS 7.8), known exploited - [CVE-2022-23270](https://www.precursorintelligence.com/what-is/cve-2022-23270): 70%, High (CVSS 8.1) - [CVE-2023-21768](https://www.precursorintelligence.com/what-is/cve-2023-21768): 65%, High (CVSS 7.8) ## Questions ### How many vulnerabilities does Windows 11 have? We track 600 published vulnerabilities listed under the name Windows 11, across 2 versions. The most recent Windows 11 flaw added to the known-exploited list is CVE-2021-43226, on 6 October 2025. ### Which Windows 11 vulnerabilities are being exploited? 2 are on the list of flaws known to be exploited. The most recently added are CVE-2021-43226 and CVE-2021-40449. ### Why are newer Windows 11 flaws missing from this page? Microsoft also lists Windows 11 under more specific names, such as Windows 11 22H2 and Windows 11 21H2. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list. ### Which versions of Windows 11 do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2021-40449, affects all versions. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Windows 11? Create a Precursor Intelligence account and track Windows 11. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Windows 11? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact