EUVD-2026-73636
GHSA-vrp7-ff8v-gvm9
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-exposed DNS service requires no authentication; AC:H reflects race condition requirement for reliable UAF exploitation; full triad from arbitrary code execution as SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via use-after-free in Windows DNS Server affects Windows Server 2022 and 2025, allowing an unauthenticated network attacker to execute arbitrary code on the DNS service host. The vulnerability resides in the DNS service's heap memory management, where a freed object is subsequently dereferenced, enabling memory corruption with full confidentiality, integrity, and availability impact per CVSS C:H/I:H/A:H. …
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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 and reachable on TCP/UDP port 53 from the attacker's network position - this service is enabled by default on any Windows Server system promoted to DNS server role or Active Directory domain controller. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) reflects high real-world severity: the attack surface is the network-facing DNS service, no authentication is required, and successful exploitation achieves full control of the affected server. … 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 security patches immediately: Windows Server 2025 (all editions) must be updated to build 10.0.26100.33438 or later; Windows Server 2022 must be updated to build 10.0.20348.5622 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows Server 2022 and 2025 instances with DNS service enabled, focusing first on production systems. …
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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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