EUVD-2026-56442
GHSA-wqhh-vq56-2wcj
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
DNS is a network service accepting unauthenticated requests; AC:H reflects heap-grooming complexity typical of use-after-free; successful RCE yields full C:H/I:H/A:H with scope unchanged.
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 via use-after-free memory corruption in Windows DNS enables unauthenticated network attackers to achieve full system compromise against exposed DNS servers. The CVSS:3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) confirms network-reachable, zero-privilege exploitation, though high attack complexity signals that reliable triggering requires precise memory state manipulation rather than simple packet delivery. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows DNS service must be reachable by the attacker over the network on UDP/TCP port 53 - this is satisfied by default for any internet-facing or network-accessible DNS server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 8.1 reflects a critical theoretical impact (C:H/I:H/A:H) tempered by high attack complexity (AC:H), which meaningfully constrains opportunistic mass exploitation. … 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 | Consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65789 for the authoritative patch and affected version list; apply the relevant Windows cumulative update as the primary remediation. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows DNS servers and audit network access policies; immediately restrict DNS service access to authorized clients only using firewall rules and Windows Firewall with Advanced Security. …
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External POC / Exploit Code
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