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CVE-2021-36968: Windows DNS Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-15 · updated 2026-08-10
• Weakness: CWE-269

Description

Windows DNS Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 7: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows 7: from 6.1.0 before 6.1.7601.25712 — fixed in 6.1.7601.25712
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25712 — fixed in 6.1.7601.25712
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.25712 — fixed in 6.1.7601.25712
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21218 — fixed in 6.0.6003.21218

How to fix

Upgrade to a fixed version: Microsoft Windows 7 6.1.7601.25712; Microsoft Windows 7 Service Pack 1 6.1.7601.25712; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25712; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21218. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36968
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36968

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