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CVE-2026-62817: Windows DNS Server Remote Code Execution Vulnerability

highCVSS 8.8CVE-2026-62817
Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.

CSIRTS triage

vendor: Microsoftproduct: Windows DNS ServerRemote code executionMemory corruption
What
Out-of-bounds write in Windows DNS allows remote code execution over an adjacent network without authentication.
Who is affected
Unauthorized remote attackers on adjacent networks with access to DNS services.
Urgency
Critical (CVSS 8.8) with unauthenticated remote exploitation; immediate patching required.
Action
Apply Windows security update addressing CVE-2026-62817 and restrict DNS query sources if needed.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-62817coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows DNS Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center