EUVD-2026-44123
GHSA-6x6m-vhw2-wp6w
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable RasMan service (AV:N), low complexity and no interaction, but requires an existing low-privileged account (PR:L); successful UAF yields full SYSTEM-level compromise, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in the Windows Remote Access Connection Manager (RasMan) service lets an authenticated, low-privileged attacker corrupt memory over the network to gain higher privileges on affected Windows 10, 11, and Server systems. The flaw is a CWE-416 use-after-free carrying a CVSS 8.8 with high impact to confidentiality, integrity, and availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | 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. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | 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. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | 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. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50666 (patch available per vendor advisory) via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50666, prioritizing internet- or LAN-exposed hosts and any systems where low-privileged users have network access to the RasMan service; consult that page for the exact KB/build numbers for each OS version, as they were not included in the input data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct an inventory of all Windows 10, 11, and Server systems to identify those running the RasMan service and prioritize patching based on criticality and data exposure. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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