# CVE-2026-81384

Heap overflow in Microsoft DNS Server allows unauthenticated remote code execution.

- Page: https://www.vulneraibility.com/cve/CVE-2026-81384
- CVSS: 8.1
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.67% (percentile 52.4)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-10)
- Weakness: CWE-122
- Published: 2026-11-10

## Affected versions

- Microsoft Windows Server 2022: affected >= 10.0.20348.0 and < 10.0.20348.5870
- Microsoft Windows Server 2025: affected >= 10.0.26100.0 and < 10.0.26100.33822
- Microsoft Windows Server 2025 (Server Core installation): affected >= 10.0.26100.0 and < 10.0.26100.33822

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated remote code execution via heap buffer overflow in DNS Server; attacker can run arbitrary code, seize DNS service, or cause denial of service.

## Action

Immediate action required

## Recommendation

Apply vendor update when available; isolate/restrict DNS servers; monitor logs and network for exploitation.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81384

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.