EUVD-2026-73275
GHSA-j9rq-q866-f8jj
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable unauthenticated DNS service; AC:H reflects race-condition or heap-grooming requirement typical of UAF exploitation; full C/I/A impact from SYSTEM-level code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows DNS Server allows unauthenticated network attackers to execute arbitrary code by exploiting a use-after-free memory corruption flaw in the DNS service. Affected systems span Windows Server 2012 through Server 2025 and two Windows 10 variants running the DNS Server role. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows DNS Server role must be installed and active on the target system - this role is not enabled by default on standard Windows Server installations but is ubiquitous on Active Directory domain controllers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is significant but tempered by the AC:H requirement. … 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 update immediately - vendor-released patches exist for all affected Windows versions as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77505. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Windows Server systems running the DNS Server role across your infrastructure using asset management tools or Active Directory queries; segregate any Internet-facing DNS servers to highest-priority patch queues. …
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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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