CVE-2022-21882: Microsoft Win32k Privilege Escalation Vulnerability

Vulnerability summary

CVE-2022-21882 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in Microsoft Win32k. It is known to be exploited: CISA lists it, first on 04-02-2022. It has been used in ransomware campaigns. EPSS estimates a 59.20% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 11-01-2022
   PublishedVulnerability first disclosed.
2. 04-02-2022
   Added to CISA KEVMicrosoft Win32k Privilege Escalation Vulnerability
3. 18-02-2022
   CISA remediation dueApply updates per vendor instructions.
4. 15-08-2026
   Last modifiedVulnerability information updated.

Description

Win32k Elevation of Privilege Vulnerability

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.