Windows RASMAN CVE-2026-69455

Exploitation requires an authenticated local session on the target Windows system with at minimum standard (low-privilege) user rights, consistent with CVSS PR:L and AV:L - remote-only access without existing code execution cannot trigger this flaw. The Remote Access Connection Manager service (RASMAN) must be running; it is enabled by default on all affected Windows versions, so no special configuration is required to expose the attack surface. No user interaction is required beyond the attacker's own actions once a foothold exists. Exploitation is bounded to local attack vectors: an attacker lacking any local execution capability (e.g., network-only access with no shell) cannot directly exploit this vulnerability. There is no indication that non-default configuration or specific feature enablement beyond RASMAN's default-on state is required.

The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately characterizes a reliable local privilege escalation: low complexity, no interaction, and full system impact once a minimal foothold exists. This makes RASMAN a high-value post-exploitation primitive - any initial access that yields a standard user shell (phishing, browser exploit, web application compromise) can chain into SYSTEM via this bug. The broad version scope (17 distinct product SKUs from Server 2012 R2 to Windows 11 26H1) maximizes real-world exposure across enterprise, cloud, and consumer environments. EPSS data was not provided in the input, so exploitation probability cannot be quantitatively stated. KEV status is not confirmed, meaning active in-the-wild exploitation has not been flagged by CISA at time of analysis. No public POC has been identified. Despite the absence of KEV/POC, the accessibility of this flaw (PR:L, AC:L) and the ubiquity of Windows deployments make patching a genuine priority for any environment where multiple users share a system or where Windows endpoints are exposed to initial-access threats.

An attacker who has obtained initial code execution as a standard Windows user - through a phishing payload, browser exploit, or compromised web application - crafts a malformed IPC or API call targeting the RASMAN service. The crafted input triggers the heap overflow, corrupts SYSTEM-level process memory, and allows the attacker to redirect execution to arbitrary code running as SYSTEM, granting full administrative control over the host. No public POC exists at time of analysis, but the low-complexity CVSS vector (AC:L) suggests the overflow is reliably triggerable without race conditions or environment-specific prerequisites.