EUVD-2026-73069
GHSA-c2r3-r855-7j88
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable unauthenticated RCE against the DNS role gives PR:N/UI:N and full C/I/A, but use-after-free reliability requires heap grooming/race so AC:H.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Microsoft Windows DNS Server role (across Windows Server 2012 through 2025 and Windows 10 1607/1809) stems from a use-after-free that an unauthenticated attacker can trigger over the network, per CVSS PR:N/UI:N. Microsoft rates it 9.8 (critical) with full confidentiality, integrity, and availability impact, and a vendor patch is available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target to be running the Windows DNS Server role and reachable by the attacker over the network on the DNS service; the CVSS vector (AV:N/PR:N/UI:N) indicates no authentication and no user interaction are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than a high-CVSS-but-low-risk case: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H) describes network-reachable, unauthenticated, no-interaction RCE against a role that is frequently internet- or intranet-facing, and Microsoft (secure@microsoft.com) has shipped a patch. … 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 security update for your OS build via the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69730); the fixed revisions are Server 2025 10.0.26100.33438, Server 2022 10.0.20348.5622, Server 2019/Win10 1809 10.0.17763.9245, Server 2016/Win10 1607 10.0.14393.9512, Server 2012 6.2.9200.26349, and Server 2012 R2 6.3.9600.23397. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server (2012, 2016, 2019, 2022, 2025) and Windows 10 (1607, 1809) systems running DNS Server role and document current patch level. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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