EUVD-2026-56682
GHSA-632v-rmmc-3pm8
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local attack requiring high privileges to reach the DNS heap overflow; unchanged scope with full CIA impact consistent with escalation to SYSTEM from an already-privileged context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows DNS across a broad range of Microsoft Windows releases stems from a numeric truncation error (CWE-122) that produces a heap-based buffer overflow, enabling an already high-privileged local attacker to escalate further - likely to SYSTEM level. The vulnerability spans Windows Server 2012 through Server 2025 and Windows 10/11 consumer editions, representing a wide patching surface. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess high local privileges (PR:H per CVSS vector AV:L/AC:L/PR:H/UI:N) on the affected Windows system - specifically, a level of access sufficient to invoke the vulnerable DNS interface or service function. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.7 accurately captures the constrained attack surface: local access (AV:L) and high privilege prerequisite (PR:H) mean an attacker cannot exploit this remotely or from an unprivileged starting point. … 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 vendor-released cumulative updates targeting the exact build thresholds confirmed in EUVD-2026-56682: update Windows Server 2025 to build 10.0.26100.33296 or later, Server 2022 to 10.0.20348.5499 or later, Server 2019 and Windows 10 1809 to 10.0.17763.9115 or later, Server 2016 and Windows 10 1607 to 10.0.14393.9418 or later, Server 2012 R2 to 6.3.9600.23337 or later, Server 2012 to 6.2.9200.26279 or later, and Windows 11 editions to their respective thresholds listed above. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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