CVE-2022-21901

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.9% (59th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 9.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Windows Hyper-V Elevation of Privilege Vulnerability

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

January 11, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 24, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21901
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21901

Vendor Advisories for CVE-2022-21901(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-10-03 14:23 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 15:49 UTCEG score recompute
  4. 2026-09-30 15:00 UTCEPSS rescore
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  6. 2026-09-28 13:48 UTCEPSS rescore
  7. 2026-09-27 13:41 UTCEPSS rescore
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  10. 2026-09-23 13:45 UTCEPSS rescore
  11. 2026-09-20 20:13 UTCEPSS rescore
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  17. 2026-09-11 14:49 UTCEPSS rescore
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  20. 2026-09-07 15:58 UTCEPSS rescore
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  24. 2026-09-04 05:04 UTCEPSS rescore
  25. 2026-09-02 14:09 UTCEPSS rescore
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  1. 2026-09-01 13:51 UTCEPSS rescore
  2. 2026-08-30 19:14 UTCEPSS rescore
  3. 2026-08-30 01:19 UTCEPSS rescore
  4. 2026-08-28 21:38 UTCEPSS rescore
  5. 2026-08-27 14:22 UTCEPSS rescore
  6. 2026-08-26 14:43 UTCEPSS rescore
  7. 2026-08-25 13:46 UTCEPSS rescore
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  9. 2026-08-24 14:13 UTCEPSS rescore
  10. 2026-08-21 23:46 UTCEPSS rescore
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  18. 2026-08-13 21:57 UTCEPSS rescore
  19. 2026-08-12 13:48 UTCEPSS rescore
  20. 2026-08-09 13:44 UTCEPSS rescore
  21. 2026-08-08 16:34 UTCEPSS rescore
  22. 2026-08-07 16:24 UTCEPSS rescore
  23. 2026-08-06 13:44 UTCEPSS rescore
  24. 2026-08-05 19:15 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
  26. 2026-08-03 10:33 UTCEPSS rescore
  27. 2026-08-02 02:24 UTCEPSS rescore
  28. 2026-08-01 04:13 UTCEPSS rescore
  29. 2026-07-30 16:25 UTCEPSS rescore
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  31. 2026-07-28 15:33 UTCEPSS rescore
  32. 2026-07-26 14:52 UTCEPSS rescore
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  34. 2026-07-25 14:15 UTCEPSS rescore
  35. 2026-07-24 14:15 UTCEPSS rescore
  36. 2026-07-23 14:16 UTCEPSS rescore
  37. 2026-07-23 02:08 UTCEG score recompute
  38. 2026-07-22 22:55 UTCEG score recompute▲ 1.00
  39. 2026-07-22 14:06 UTCEPSS rescore
  40. 2026-07-22 14:06 UTCEPSS rescore
  41. 2026-07-21 15:22 UTCEPSS rescore
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  43. 2026-07-20 17:05 UTCEPSS rescore
  44. 2026-07-19 14:29 UTCEPSS rescore
  45. 2026-07-19 02:27 UTCEPSS rescore
  46. 2026-07-18 10:02 UTCEPSS rescore
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  48. 2026-07-16 17:00 UTCEPSS rescore
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  50. 2026-07-15 16:56 UTCEPSS rescore
  51. 2026-07-15 16:56 UTCEPSS rescore
  52. 2026-07-15 01:58 UTCEPSS rescore
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  54. 2026-07-13 22:27 UTCEPSS rescore
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  57. 2026-07-12 05:44 UTCEPSS rescore
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  59. 2026-07-09 19:07 UTCEPSS rescore
  60. 2026-07-08 15:12 UTCEPSS rescore
  61. 2026-07-07 13:44 UTCEPSS rescore
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  68. 2026-07-01 15:04 UTCEPSS rescore
  69. 2026-06-30 23:20 UTCEPSS rescore
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  71. 2026-06-29 14:04 UTCEPSS rescore
  72. 2026-06-29 14:04 UTCEPSS rescore
  73. 2026-06-28 14:06 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2022-21901?
CVE-2022-21901 is a critical vulnerability published on January 11, 2022. Windows Hyper-V Elevation of Privilege Vulnerability
When was CVE-2022-21901 disclosed?
CVE-2022-21901 was first published on January 11, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-21901 actively exploited?
CVE-2022-21901 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-21901?
CVE-2022-21901 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2022-21901?
A fix for CVE-2022-21901 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-21901 are linked in the Vendor Advisories panel on this page.

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