CVE-2025-62465: 
vulnerability analysis and mitigation

CVE-2025-62465 is a null pointer dereference vulnerability in Windows DirectX that allows an authorized local attacker to cause a denial of service. It was disclosed by Microsoft on December 9, 2025, as part of the December 2025 Patch Tuesday security update cycle. Affected products include Windows 11 versions 23H2, 24H2, and 25H2, as well as Windows Server 2022, Windows Server 2022 23H2 Edition, and Windows Server 2025. The vulnerability carries a CVSS v3.1 base score of 6.5 (Medium) (Microsoft MSRC).

The root cause is a null pointer dereference (CWE-476) within the Windows DirectX subsystem, triggered when the component fails to properly validate a pointer before dereferencing it. An attacker with low-privilege local access and no user interaction required can exploit this flaw to crash or destabilize the affected system. The attack vector is local, requires low privileges, and has a changed scope, meaning the impact extends beyond the vulnerable component itself to affect system availability. No public technical write-ups or proof-of-concept code have been identified at this time (Microsoft MSRC).

Successful exploitation results in a denial of service condition, crashing or destabilizing the Windows system and potentially interrupting critical services or causing system downtime. The vulnerability has no confidentiality or integrity impact — only availability is affected. Because the scope is marked as changed, the crash may affect components or processes beyond the DirectX subsystem itself, amplifying the disruption on affected Windows 11 and Windows Server 2022/2025 systems (Microsoft MSRC).

Microsoft released patches for CVE-2025-62465 on December 9, 2025, as part of the December 2025 Patch Tuesday update. Organizations should apply the relevant cumulative updates to bring affected systems to the following minimum build versions: Windows 11 23H2 → 10.0.22631.6345, Windows 11 24H2/25H2 and Windows Server 2025 → 10.0.26100.7392, Windows Server 2022 → 10.0.20348.4467, and Windows Server 2022 23H2 → 10.0.25398.2025. As interim measures, organizations should enforce least-privilege principles to limit local user access and monitor systems for unexpected crashes or service interruptions (Microsoft MSRC).

CVE-2025-62465 was covered as part of broader December 2025 Patch Tuesday roundups by multiple security outlets. BleepingComputer noted the December 2025 update addressed 57 flaws including 3 zero-days, with this vulnerability receiving minimal individual attention given its medium severity and local-only attack vector (BleepingComputer). Sophos and Zero Day Initiative also published Patch Tuesday review posts covering the December release without singling out this CVE as a high-priority concern (Sophos, ZDI).