CVE-2026-70330: Windows DNS Elevation of Privilege Vulnerability

CSIRTS triage

What

Heap-based buffer overflow in Windows DNS allows authorized elevation of privilege locally.

Who is affected

Authorized users on systems running Windows DNS service.

Urgency

Medium priority; CVSS 6.7 and local attack vector limit immediate risk.

Action

Apply Microsoft security updates for Windows DNS when available.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 6.7

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70330

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-703300.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
• mediumCVE-2026-70330: Heap-based buffer overflow in Windows DNS allows an authorized attacker to elevate privileges …nvd

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