Use-after-free in Microsoft Windows and Windows Server - CVE-2023-21822

Vulnerability identifier: #VU72226

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-21822

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary error win32kfull driver in Windows Graphics Component. A local user can trigger a use-after-free error and execute arbitrary code with SYSTEM privileges.

Microsoft Windows
Windows Server

Install updates from vendor's website.

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21822
• https://www.zerodayinitiative.com/advisories/ZDI-23-163/

• Privilege escalation in Microsoft Windows Graphics Component