CVE-2021-41357

CVE-2021-41357 is a high-severity (CVSS 7.8) vulnerability in Microsoft Win32k. CISA added it to the Known Exploited Vulnerabilities catalog on April 25, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 16, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

Win32k Elevation of Privilege Vulnerability

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41357