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CVE-2021-36934: Microsoft Windows SAM Local Privilege Escalation Vulnerability

criticalknown exploitedpublic exploitCVE-2021-36934
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
If a Volume Shadow Copy (VSS) shadow copy of the system drive is available, users can read the SAM file which would allow any user to escalate privileges to SYSTEM level.

CSIRTS triage

vendor: Microsoftproduct: WindowsPrivilege escalation
What
Users can read the SAM file from a Volume Shadow Copy, allowing privilege escalation to SYSTEM level.
Who is affected
Users of Microsoft Windows with available Volume Shadow Copies are affected.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and its exploitation status.
Action
Apply the latest security updates for Windows.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-02-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-36934

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-36934coverage & exploitation statusNVD · CVE.org

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