Affects Microsoft DNS Server (widely deployed); unauthenticated RCE against DNS infrastructure can disrupt enterprise networks and services.
CVE-2026-81384
Heap overflow in Microsoft DNS Server allows unauthenticated remote code execution.
Is CVE-2026-81384 being exploited?
Not confirmed. CVE-2026-81384 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.67% probability of exploitation in the next 30 days.
How severe is CVE-2026-81384?
CVE-2026-81384 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-81384?
Yes. A fix has been recorded for CVE-2026-81384. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-81384 affect?
CVE-2026-81384 affects Microsoft DNS Server (Windows Server DNS role). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-81384?
Apply vendor update when available; isolate/restrict DNS servers; monitor logs and network for exploitation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote code execution via heap buffer overflow in DNS Server; attacker can run arbitrary code, seize DNS service, or cause denial of service.
Immediate action required
- affected>= 10.0.20348.0 and < 10.0.20348.5870
- affected>= 10.0.26100.0 and < 10.0.26100.33822
- affected>= 10.0.26100.0 and < 10.0.26100.33822
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 10 Nov 2026 (SSVC 2.0.3).
timeline
- 10 Nov 2026Published
- 10 Nov 2026CISA SSVC assessment: exploitation none · same day later
- 11 Nov 2026CVE record last updated · 1 day later
- 12 Nov 2026Analysed by vulneraibility.com · 1 day later
- Patchmsrc.microsoft.com /update-guide/vulnerability/CVE-2026-81384
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.