CVE DATABASE / CVE-2021-28310
CVE-2021-28310
Microsoft Win32k Privilege Escalation Vulnerability
CVSS 7.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2021-11-17.
Required action: Apply updates per vendor instructions.
Summary
Win32k Elevation of Privilege Vulnerability
CVSS 3.1 breakdown
| Base score | 7.8 (HIGH) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft windows 10 1803Microsoft windows 10 1809Microsoft windows 10 1909Microsoft windows 10 2004Microsoft windows 10 20h2Microsoft windows server 1909Microsoft windows server 2004Microsoft windows server 2019Microsoft windows server 20h2
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References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28310
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28310
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-30. Always verify against the vendor advisory before acting.