CVE-2026-70091: Windows DNS Denial of Service Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to deny service over a network.
Other sources
Windows DNS Denial of Service 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 6.2.9200.26349Patch KB5123065 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
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Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
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Fixed in 6.3.9600.23397Patch KB5123066 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871
Event History
Frequently Asked Questions
Which systems are in scope for this issue?
The affected software list includes Microsoft Windows 10 and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. The vulnerability is in Windows DNS.
Does exploitation require authentication or user interaction?
No. The supplied vector indicates network-based exploitation with no privileges required and no user interaction.
What is the expected impact if exploitation succeeds?
The stated impact is denial of service affecting availability. The supplied vector indicates no confidentiality or integrity impact.
How difficult is exploitation expected to be?
The supplied vector rates attack complexity as high. Exploitation requires conditions suitable for triggering the improper synchronization race condition.