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CVE-2021-36942

Windows LSA Spoofing Vulnerability

CVSS 7.5 HIGHEPSS 66.0%● KEV
Vexday Risk Score
78High priority
SSVC decision (CISA)
Act
Exploitation + impact → act immediately
CVSS 7.5EPSS 66.0%KEV simPoC Nuclei Metasploit simPatch
Lifecycle
12 Aug 2021Published on NVD
03 Nov 2021Active exploitation (CISA KEV)
Recommendation: Patch as soon as possible — active exploitation confirmed.
In short

A spoofing vulnerability in Windows LSA (Local Security Authority) allows an attacker to impersonate legitimate security processes, potentially gaining unauthorized access to system resources. This matters because LSA is fundamental to Windows authentication and authorization.

Technical detail

The vulnerability allows local or network-based attackers to spoof LSA authentication mechanisms under certain conditions, bypassing security checks and impersonating privileged processes. Attack requires network or local access with specific pre-conditions; successful exploitation leads to authentication bypass and unauthorized access to protected resources.

Summary generated and translated by AI from the official description.
Windows LSA Spoofing Vulnerability
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C

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