What is CVE-2026-62817?

CVE-2026-62817 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Windows DNS Server Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-62817 cover?

CVE-2026-62817 covers the following CVE IDs: CVE-2026-62817. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-62817?

CVE-2026-62817 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-62817?

CVE-2026-62817 affects 6 products, including: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2022 (Server Core installation); Windows Server 2025; and others — see the full list on the advisory page.

CVE-2026-62817CriticalCVSS 8.8

Windows DNS Server Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-62817 →

📋 Description

Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.

🎯 Affected products6

Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5120238 (Security Update) — fixed build 10.0.17763.9121 KB5120242 (Security Update) — fixed build 10.0.20348.5499 KB5120229 (Security Hotpatch Update) — fixed build 10.0.20348.5440 KB5120233 (Security Update) — fixed build 10.0.26100.33296 KB5120228 (Security Hotpatch Update) — fixed build 10.0.26100.33222

🔗 References (11)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5120238
referencehttps://support.microsoft.com/help/5120238
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5120242
referencehttps://support.microsoft.com/help/5120242
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5120229
referencehttps://support.microsoft.com/help/5120229
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5120233
referencehttps://support.microsoft.com/help/5120233
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5120228
referencehttps://support.microsoft.com/help/5120228