EUVD-2026-73341
GHSA-hw9g-6x2v-394x
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; AC:H reflects UAF race-condition timing requirement; full C/I/A impact consistent with SYSTEM-level code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via use-after-free in the Windows DNS Server service allows an unauthenticated remote attacker to execute arbitrary code on affected Windows Server systems by sending crafted DNS queries that trigger a memory corruption condition. The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/C:H/I:H/A:H) reflects full-triad impact but high attack complexity, consistent with UAF exploitation requiring precise timing or race-condition manipulation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows DNS Server role (dns.exe) must be installed and running on the target - this is not enabled by default on Windows desktop editions or bare Server installations. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) correctly characterizes this as a serious but not trivially exploitable network RCE. … 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 Microsoft's security updates immediately via Windows Update or WSUS. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows Server systems with DNS services, particularly those accepting external queries. …
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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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