CVE-2025–21333 is a vulnerability detected by Microsoft as actively exploited by threat actors. Microsoft patched the vulnerability on January 14th, 2024 with KB5050021 (for Windows 11 23H2/22H2)…

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CVE-2025–21333 is a Windows vulnerability that involves a heap-based buffer overflow in the vkrnlintvsp.sys driver, which Microsoft patched in January 2024. The vulnerability allows threat actors to achieve arbitrary read/write access in the kernel and escalate privileges to SYSTEM. The post provides a detailed analysis of the vulnerability, its exploitation process, limitations, and detection methods. The full proof-of-concept (PoC) code is available on GitHub.

CVE-2025–21333 Windows heap-based buffer overflow analysis