EUVD-2026-73634
GHSA-wmcw-f6mg-6m69
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-accessible DNS service, no auth required, but UAF exploitation demands specific heap state, justifying AC:H; full C/I/A on successful exploit.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows DNS server components allows unauthenticated network attackers to execute arbitrary code by exploiting a use-after-free memory corruption flaw. The vulnerability spans Windows Server 2012 through 2025, covering the core DNS infrastructure underpinning Active Directory environments globally. …
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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 installed and running - this is not enabled by default on all Windows systems but is present on all Active Directory domain controllers and dedicated DNS infrastructure. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score with AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H accurately reflects a high-impact but non-trivial-to-exploit vulnerability. … 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 Microsoft-released patch as distributed through Windows Update or WSUS, targeting the build thresholds listed per OS: Server 2012/2012 R2 via ESU patches, Server 2016 to 10.0.14393.9512+, Server 2019 to 10.0.17763.9245+, Server 2022 to 10.0.20348.5622+, Server 2025 to 10.0.26100.33438+. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: conduct an inventory of all Windows DNS Server deployments, particularly production Active Directory-integrated servers, and document current patch levels. …
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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
Leaving vuln.today