CVE-2026-70207: Microsoft Network Policy Server heap buffer overflow

CVE-2026-70207 · Severity: high · CVSS 7.5 · Published 2026-10-13

Network Policy Server (NPS) is a Microsoft component that authenticates and authorizes user access to enterprise networks. A heap buffer overflow vulnerability allows an authorized network attacker to execute arbitrary code with elevated privileges, potentially compromising the entire network infrastructure that relies on NPS for access control.

Technologies: Microsoft Network Policy Server. Vendors: Microsoft.

Quick answers

Is CVE-2026-70207 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-70207 being exploited in the wild.
How severe is CVE-2026-70207?
High severity, with a CVSS score of 7.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Network Policy Server.
Is there a fix for CVE-2026-70207?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-70207 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-70207?
Check whether you run Microsoft Network Policy Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow exists in Microsoft Network Policy Server, exploitable by an authorized attacker over the network. The vulnerability allows remote code execution when an attacker sends a specially crafted request to the affected service.

Affected products

  • Microsoft Network Policy Server

Timeline

  • 2026-10-13: disclosed

References

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