CVE-2021-36934

unknown KEV

Published 2022-02-10 · Modified 2022-02-10

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

2.5

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.

CISA KEV

Vendor: Microsoft
Product: Windows
Due date: 2022-02-24

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Metasploit modules

post_windows/gather/credentials/windows_sam_hivenightmare rank 300

Windows SAM secrets leak - HiveNightmare

Source code queued for fetch — refresh in a moment.

References

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

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.