CVE-2026-85371

8.1High

Published 13 Oct 2026 · NVD status: Undergoing Analysis · AI triage by gemini-3.8-flash

8.1High

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-416

Impact

Remote, unauthenticated attackers can execute arbitrary code on the server over the network. They only need network reachability to the Network Policy Server (NPS) service.

Root cause

A use-after-free flaw in the Network Policy Server service permits execution of arbitrary code via crafted network traffic.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the Microsoft security update for Network Policy Server from the MSRC advisory; if unable to patch immediately, restrict network access to the NPS ports (UDP 1812/1813 and 1645/1646) using firewall rules.

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Use after free in Network Policy Server (NPS) allows an unauthorized attacker to execute code over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85371

Source: nvd.nist.gov/vuln/detail/CVE-2026-85371