Desktop Window Manager Core Library 10.0.10240.0 - Privilege Escalation

Desktop Window Manager Core Library 10.0.10240.0 - Privilege Escalation 🚨

A heap-based buffer overflow exists in a DWM core library code path that processes frame/composition data. This vulnerability, identified as CVE-2025-59254, affects Microsoft’s Windows Desktop Window Manager (DWM) – DWM Core Library. When an oversized frame or untrusted input is copied into an underestimated heap allocation, adjacent heap memory can be overwritten, causing memory corruption. This class of vulnerability can lead to local privilege escalation where the vulnerable code path is reachable by a local, unprivileged actor and the process runs with elevated privileges.

Disclosure Details 📅

The disclosure, dated 2025-11-04 by nu11secur1ty, intentionally contains sanitized, non-actionable evidence suitable for vendor triage. It does not include exploit code, raw addresses, offsets, or gadget/ROP information. Exploit code enabling privilege escalation is intentionally withheld. Additionally, a Proof of Concept (PoC) was omitted from this disclosure to maintain responsible, non-actionable reporting. The reporter stated, “I will not assist in purchasing, locating, or procuring weaponized exploit code or services.”

For vendor triage, a sanitized evidence report attached to the disclosure (sanitized ASan-like block + heap snapshots) was provided. If the vendor requests further detail for internal validation, sanitized crash traces and safe pedagogical harnesses can be provided under an agreed disclosure channel and embargo.

Affected Software 🖥️

Affected software includes Windows Desktop Window Manager (DWM) – DWM Core Library, with impact on affected desktop/server releases as per vendor advisories. For mitigation, users and administrators are advised to consult the Microsoft Security Update Guide (vendor advisory) for exact patch IDs.

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