Zero-day vulnerability in Windows

Buffer overflow
CVE-2021-36948

Vulnerability details

Advisory: SB2021081014 - Privilege escalation in Microsoft Windows Update Medic Service

Vulnerable component: Windows

CVE-ID: CVE-2021-36948

CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Description:

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the Windows Update Medic Service. A local user can run a specially crafted program to execute arbitrary code with elevated privileges.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-36948