Windows RasMan EUVD-2026-44123

Exploitation targets the Remote Access Connection Manager (RasMan) service and requires the attacker to already hold low-level privileges (CVSS PR:L) - this is not an unauthenticated internet drive-by; a valid account or existing foothold with network reach to the service is the prerequisite. No user interaction is needed (UI:N) and attack complexity is low (AC:L), so once the attacker has that low-privilege network access to a system where RasMan is running (its default state on Windows client and server SKUs), few additional conditions limit the attack. Limiting factors: the required pre-existing authentication/privilege, and the fact that disabling or firewalling the RasMan service removes the reachable attack surface.

The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, 8.8) indicates a network-reachable, low-complexity attack requiring only low existing privileges and no user interaction, yielding full high impact to C/I/A within an unchanged scope - a strong elevation-of-privilege signal. No EPSS score, SSVC decision, KEV listing, or POC was provided, so real-world exploitation pressure cannot be quantified from the input; the absence of KEV and any exploit reference suggests this is not yet under active or widespread exploitation. Note a tension worth flagging: the description frames this as 'elevate privileges over a network' and the vector is AV:N, yet EoP use-after-free bugs in RasMan are frequently exploited locally in practice - verify the true remote reachability against the Microsoft advisory before deprioritizing network-side controls. Overall this is a credible patch-now priority given ubiquitous deployment and a clean unauthenticated-of-complexity profile, tempered by the fact that PR:L means the attacker must already hold some foothold.

A low-privileged attacker who has already authenticated to the environment (for example, a standard domain user or a foothold on a workstation) sends specially crafted requests to the Remote Access Connection Manager service to trigger the use-after-free and reallocate the freed object under their control. By grooming the heap and steering the dangling reference, they execute code or corrupt state in RasMan's elevated context, escalating from limited user to SYSTEM-level privileges. No user interaction is required and attack complexity is low, though no public exploit code has been identified at time of analysis.