CVE-2026-83869: Windows Domain Name Service Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.
Other sources
Windows Domain Name Service 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 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
The affected software list includes Microsoft Windows 10, Windows 11, and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Exposure specifically concerns systems running the DNS Server component.
Does exploitation require authentication or user interaction?
No. The supplied vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What impact could successful exploitation have?
Successful exploitation can allow remote code execution. The supplied severity vector rates confidentiality, integrity, and availability impacts as high.