EUVD-2026-73321
GHSA-288r-53p6-9f5p
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
DNS is a network-facing unauthenticated service; UAF causes crash only, so C:N/I:N/A:H with unchanged scope.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.
AnalysisAI
Use-after-free (CWE-416) in the Windows DNS service enables unauthenticated remote attackers to crash the DNS server, causing a denial-of-service condition across affected Windows Server and Windows 10 deployments. The vulnerability exists in DNS server processing logic where memory is freed and subsequently accessed, corrupting heap state and triggering a service crash. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows DNS Server service (dns.exe) must be running on the target host - this role is active by default on Windows Server systems configured as domain controllers or DNS servers, but is not active by default on standard Windows 10 workstation deployments unless explicitly installed via RSAT. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite a CVSS base score of 7.5 (High), several signals collectively de-prioritize this finding relative to its raw score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released security update from Microsoft via Windows Update or WSUS to reach the following fixed build versions: Windows Server 2012 to 6.2.9200.26349 or later, Windows Server 2012 R2 to 6.3.9600.23397 or later, Windows Server 2016 to 10.0.14393.9512 or later, Windows Server 2019 to 10.0.17763.9245 or later, Windows Server 2022 to 10.0.20348.5622 or later, and Windows Server 2025 to 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server and Windows 10 systems running DNS services and begin patch validation in staging environments. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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