Is CVE-2026-70066 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-70066 being exploited in the wild.

How severe is CVE-2026-70066?

High severity, with a CVSS score of 7, published 13 October 2026.

Is there a fix for CVE-2026-70066?

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-2026-70066 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-70066?

Check whether you run Microsoft Windows DHCP Server, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. 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.

CVE-2026-70066: Microsoft Windows DHCP Server use after free privilege escalation

CVE-2026-70066 · Severity: high · CVSS 7 · Published 2026-10-13

Windows DHCP Server, which manages network address assignments in enterprises, contains a memory safety flaw that allows an authenticated attacker to gain elevated privileges on the local system. An attacker with user-level access could exploit this to run code with system-level permissions, potentially compromising the entire network infrastructure.

Technologies: Microsoft Windows DHCP Server, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-70066 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-70066 being exploited in the wild.
How severe is CVE-2026-70066?: High severity, with a CVSS score of 7, published 13 October 2026.
Which products and versions are affected?: Microsoft Windows DHCP Server.
Is there a fix for CVE-2026-70066?: 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-2026-70066 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-70066?: Check whether you run Microsoft Windows DHCP Server, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. 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 use-after-free vulnerability in Windows DHCP Server allows an authorized local attacker to escalate privileges. The flaw requires prior authentication or local access to trigger, and successful exploitation grants elevated system privileges that can be used for further compromise of network services.

Affected products

Microsoft Windows DHCP Server

Timeline

2026-10-13: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70066

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