EUVD-2026-56662
GHSA-wwxw-rcqm-87qp
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-facing DNS requires no credentials (AV:N/PR:N); AC:H reflects race condition timing requirement; full C/I/A impact consistent with privilege escalation to SYSTEM level.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows DNS allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation via use-after-free in the Windows DNS service exposes a broad range of Windows Server and Windows 10 systems to network-based attacks by unauthenticated adversaries. The race condition root cause (CWE-362) forces high attack complexity, as an attacker must win a precise timing window to corrupt freed memory and gain elevated privileges, reflected in the CVSS 8.1 score. …
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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 the DNS service must be running and reachable over the network - this is the default and expected state for any system configured as a DNS resolver or authoritative server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score reflects high theoretical impact (C:H/I:H/A:H) tempered by high attack complexity (AC:H), the latter directly attributable to the race condition exploitation requirement - an attacker must reliably win a timing window rather than send a single malformed packet. … 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 | The primary remediation is to apply Microsoft's security update, confirmed available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62778. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct inventory of all Windows Server (2012-2025) and Windows 10 systems to identify DNS infrastructure and establish patching priority. …
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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