Windows 10 1803
CVE-2021-1732
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft) · only source for this CVE.
CVSS VectorVendor: microsoft
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.
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
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today