CVE-2026-62820: Windows DNS Server Remote Code Execution Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to execute code over a network.
Other sources
Windows DNS Server Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9115Patch KB5120238 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9418Patch KB5120418 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62820?
CVE-2026-62820 has a severity rating of 8.1, categorized as high risk.
How can I fix CVE-2026-62820?
To mitigate CVE-2026-62820, apply the latest security updates released by Microsoft for affected Windows versions.
What systems are affected by CVE-2026-62820?
CVE-2026-62820 affects Microsoft Windows 10, Windows Server 2016, 2019, 2022, and 2025.
What type of vulnerability is CVE-2026-62820?
CVE-2026-62820 is classified as a race condition vulnerability in Windows DNS.
What can an attacker do with CVE-2026-62820?
An unauthorized attacker can execute remote code over a network due to the vulnerability in Windows DNS.