February 10, 2022 · Applied Cybernetics Group
CVE-2021-36934 — Microsoft Windows
Microsoft Windows SAM Local Privilege Escalation Vulnerability
- Added to KEV
2022-02-10- Federal due date
2022-02-24- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 99.2th percentile (score 0.673, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1068 , T1078 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-36934
CISA short description
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.
Required action
Apply updates per vendor instructions.