Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
Windows Win32k Elevation of Privilege Vulnerability
AnalysisAI
Windows Win32k contains an out-of-bounds write vulnerability enabling local privilege escalation to SYSTEM, exploited by the Bitter APT group in February 2021 for targeted espionage operations.
Technical ContextAI
The CWE-787 out-of-bounds write in win32k.sys occurs during processing of specific window message operations. The kernel write primitive enables token manipulation for privilege escalation from any user context to SYSTEM.
Affected ProductsAI
Microsoft Windows 10 (multiple versions) Microsoft Windows Server 2019/2004/20H2
RemediationAI
Apply Microsoft security update. Deploy Win32k syscall filtering via Windows Defender Exploit Guard ASR rules.
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Same weakness CWE-787 – Out-of-bounds Write
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External POC / Exploit Code
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