CVE-2025-64679: 
vulnerability analysis and mitigation

CVE-2025-64679 is a heap-based buffer overflow vulnerability in the Windows Desktop Window Manager (DWM) Core Library that allows a locally authorized attacker to elevate privileges. Disclosed on December 9, 2025, as part of Microsoft's December 2025 Patch Tuesday, it affects a wide range of Windows versions including Windows 10 (1507 through 22H2), Windows 11 (22H2 through 25H2), Windows Server 2016, 2019, 2022, and 2025. It carries a CVSS v3.1 base score of 7.8 (High) (Microsoft MSRC).

The vulnerability is classified as CWE-122 (Heap-based Buffer Overflow) and is associated with CAPEC-92 (Forced Integer Overflow). An attacker with low-privileged local access can trigger the overflow in the DWM Core Library without requiring user interaction, allowing them to corrupt heap memory and escalate privileges. The attack vector is local, with low attack complexity and no user interaction required, making it straightforward to exploit once local access is obtained (Microsoft MSRC).

Successful exploitation grants a low-privileged local attacker complete control over the affected system, with high impact to confidentiality, integrity, and availability. The attacker can effectively gain SYSTEM-level privileges, enabling arbitrary code execution, credential theft, persistence mechanisms, and lateral movement within the network. All supported Windows client and server versions are affected, making the potential blast radius significant in enterprise environments (Microsoft MSRC).

Microsoft released patches on December 9, 2025, addressing this vulnerability across all affected platforms. Patched versions include: Windows 10 1507 (10.0.10240.21161), Windows 10 1607/Server 2016 (10.0.14393.8519), Windows 10 1809/Server 2019 (10.0.17763.7919), Windows 10 21H2 (10.0.19044.6456), Windows 10 22H2 (10.0.19045.6456), Windows 11 22H2 (10.0.22621.6060), Windows 11 23H2 (10.0.22631.6060), Windows 11 24H2/Server 2025 (10.0.26100.6899), Windows 11 25H2 (10.0.26200.6899), Windows Server 2022 (10.0.20348.4294), and Windows Server 2022 23H2 (10.0.25398.1913). Organizations should apply the December 2025 cumulative updates immediately and enforce the principle of least privilege to limit the impact of any local attacker (Microsoft MSRC).

The vulnerability was covered as part of broader December 2025 Patch Tuesday roundups by multiple security outlets. Bleeping Computer noted it among the 57 flaws fixed that month, while Zero Day Initiative and Sophos published their standard monthly patch review analyses (BleepingComputer, ZDI Blog, Sophos News). No specific researcher commentary or significant social media discussion focused exclusively on this CVE was identified.