Windows 11 vulnerabilitiesAnd the versions its exploited flaws hit.
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.
The most recent Windows 11 flaw added to the known-exploited list is CVE-2021-43226, on 6 October 2025. We keep watching the known-exploited list.
Is Windows 11 listed under other names? Yes.
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. If you run one of these, open its page for its own exploited flaws.
Which versions of Windows 11 do the exploited flaws hit?
Each exploited flaw lists the versions it affects, as published by the vendor. Find your version, then patch.
- CVE-2021-40449Exploited list, 17 Nov 2021
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. It is in the list below.
Which Windows 11 vulnerabilities are being exploited?
2 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.8Microsoft Windows Privilege Escalation Vulnerability
Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.
- 7.8Microsoft Windows Win32k Privilege Escalation Vulnerability
Unspecified vulnerability allows for an authenticated user to escalate privileges.
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. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 93%CVE-2022-21907Critical
HTTP Protocol Stack Remote Code Execution Vulnerability
- 93%CVE-2023-21758High
Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability
- 91%CVE-2022-26809Critical
Remote Procedure Call Runtime Remote Code Execution Vulnerability
- 89%CVE-2022-30216High
Windows Server Service Tampering Vulnerability
- 86%CVE-2022-37958High
SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability
- 79%CVE-2022-21972High
Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability
- 76%CVE-2022-34721Critical
Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability
- 74%
Win32k Elevation of Privilege Vulnerability
- 70%CVE-2022-23270High
Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability
- 65%CVE-2023-21768High
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Running Windows 11? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
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1 flaw being exploited affects software Acme tracks
Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.
- Matched to
- Windows 11 on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
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.
2 are on the list of flaws known to be exploited. The most recently added are CVE-2021-43226 and CVE-2021-40449.
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.
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.
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.