Windows Resume EUVD-2026-99773

Exploitation requires the attacker to already possess local, authenticated access to the host with low-level (standard user) privileges (AV:L/PR:L), and to reach the vulnerable Windows Resume functionality to deliver the crafted input that triggers the heap overflow. No user interaction is needed (UI:N), and default configurations of the listed Windows 10/11 and Windows Server builds are affected. The primary limiting factor is the local-access and prior-authentication prerequisite - this flaw cannot be exploited remotely or by an unauthenticated attacker, so it is realistically a second-stage escalation step rather than an initial compromise vector.

CVSS 3.1 base score 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H describes a local privilege-escalation flaw: the attacker must already have local access and low-level (authenticated) privileges, low attack complexity, no user interaction, and achieves high confidentiality, integrity, and availability impact within an unchanged scope. This is a classic post-compromise escalation primitive rather than an initial-access vector - consistent with the heap-based buffer overflow (CWE-122) in the Windows Resume component. No EPSS score, CISA KEV listing, SSVC decision data, or public POC was provided in the input, so exploitation probability cannot be quantified and there is no evidence of active exploitation or weaponization. There are no conflicting signals (the CVSS local vector aligns with the 'elevate privileges locally' description); the main limitation is simply the absence of exploitation-likelihood telemetry. Given Windows' ubiquity, a confirmed vendor patch, and the reliability of heap-overflow EoP bugs as part of exploit chains, this should be treated as a routine-but-important patch priority - not an emergency, absent any exploitation evidence, but a standard-cadence fix because local EoP bugs are frequently chained after initial access.

An attacker who has already gained a low-privileged foothold on a Windows host (e.g., via phishing or a compromised standard user account) invokes the vulnerable Windows Resume functionality with crafted input that overflows a heap buffer, corrupting adjacent memory to hijack execution and escalate to SYSTEM. Because the CVSS vector is AV:L/PR:L and requires no user interaction, exploitation is low-complexity but requires prior local access. No public exploit code was identified in the provided data.