Windows CVE-2026-20820
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap buffer overflow in Windows Common Log File System Driver (affecting Windows 10 1607, Server 2016, and Server 2022 23h2) enables authenticated local users to achieve complete system compromise through privilege escalation. The vulnerability requires valid credentials but no user interaction, making it a direct path to administrative control for insiders or attackers with initial access. …
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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.
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