# Windows Server vulnerabilities > Windows Server is made by Microsoft. We track 305 published vulnerabilities listed under that exact name, across 10 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 Server 2016, so check those pages too. Canonical page: https://www.precursorintelligence.com/product/microsoft/windows_server ## At a glance - **Made by:** [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) - **Published vulnerabilities:** 305 - **Known to be exploited:** 2 (listed under the name Windows Server) - **Versions tracked:** 10 - **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 Server listed under other names? Microsoft also lists Windows Server under more specific names, such as Windows Server 2016 and Windows Server 2019. Flaws listed only under those names are counted on their own pages, not here. - [Windows Server 2016](https://www.precursorintelligence.com/product/microsoft/windows_server_2016): 4,711 published vulnerabilities - [Windows Server 2019](https://www.precursorintelligence.com/product/microsoft/windows_server_2019): 4,111 published vulnerabilities - [Windows Server 2008](https://www.precursorintelligence.com/product/microsoft/windows_server_2008): 3,906 published vulnerabilities - [Windows Server 2012](https://www.precursorintelligence.com/product/microsoft/windows_server_2012): 3,842 published vulnerabilities - [Windows Server 2022](https://www.precursorintelligence.com/product/microsoft/windows_server_2022): 2,137 published vulnerabilities - [Windows Server 2022 23H2](https://www.precursorintelligence.com/product/microsoft/windows_server_2022_23h2): 1,060 published vulnerabilities - [Windows Server 2003](https://www.precursorintelligence.com/product/microsoft/windows_server_2003): 653 published vulnerabilities - [Windows Server 2025](https://www.precursorintelligence.com/product/microsoft/windows_server_2025): 549 published vulnerabilities - [Windows Server 20H2](https://www.precursorintelligence.com/product/microsoft/windows_server_20h2): 52 published vulnerabilities - [Windows Server 1803](https://www.precursorintelligence.com/product/microsoft/windows_server_1803): 34 published vulnerabilities - [Windows Server 2004](https://www.precursorintelligence.com/product/microsoft/windows_server_2004): 26 published vulnerabilities - [Windows Server 1903](https://www.precursorintelligence.com/product/microsoft/windows_server_1903): 25 published vulnerabilities ## Which versions of Windows Server do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. - [CVE-2021-43226](https://www.precursorintelligence.com/what-is/cve-2021-43226) (Microsoft Windows Privilege Escalation Vulnerability): 20h2, 2022 - [CVE-2012-4969](https://www.precursorintelligence.com/what-is/cve-2012-4969) (Microsoft Internet Explorer Use-After-Free Vulnerability): 2003-sp2, 2008-sp2 ## Which Windows Server 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-2012-4969](https://www.precursorintelligence.com/what-is/cve-2012-4969): Microsoft Internet Explorer Use-After-Free Vulnerability. High, CVSS 8.1, chance of use in 30 days 80%, known exploited since 8 June 2022. ## Which Windows Server 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-2012-4969](https://www.precursorintelligence.com/what-is/cve-2012-4969): 80%, High (CVSS 8.1), known exploited - [CVE-2022-21972](https://www.precursorintelligence.com/what-is/cve-2022-21972): 79%, High (CVSS 8.1) - [CVE-2022-26937](https://www.precursorintelligence.com/what-is/cve-2022-26937): 76%, Critical (CVSS 9.8) - [CVE-2022-23270](https://www.precursorintelligence.com/what-is/cve-2022-23270): 70%, High (CVSS 8.1) - [CVE-2017-11873](https://www.precursorintelligence.com/what-is/cve-2017-11873): 70%, High (CVSS 7.5) - [CVE-2017-11861](https://www.precursorintelligence.com/what-is/cve-2017-11861): 64%, High (CVSS 7.5) - [CVE-2017-11870](https://www.precursorintelligence.com/what-is/cve-2017-11870): 60%, High (CVSS 7.5) - [CVE-2022-23253](https://www.precursorintelligence.com/what-is/cve-2022-23253): 56%, Medium (CVSS 6.5) - [CVE-2021-26414](https://www.precursorintelligence.com/what-is/cve-2021-26414): 50%, Medium (CVSS 4.8) ## Questions ### How many vulnerabilities does Windows Server have? We track 305 published vulnerabilities listed under the name Windows Server, across 10 versions. The most recent Windows Server flaw added to the known-exploited list is CVE-2021-43226, on 6 October 2025. ### Which Windows Server 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-2012-4969. ### Why are newer Windows Server flaws missing from this page? Microsoft also lists Windows Server under more specific names, such as Windows Server 2016 and Windows Server 2019. 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 Server do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2021-43226, affects 20h2, 2022. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Windows Server? Create a Precursor Intelligence account and track Windows Server. 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 Server? 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