CVE-2021-31979

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 5%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Windows Kernel Elevation of Privilege Vulnerability

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
5%
EPSS %ILE
91%
KEV
⚠ Exploited

Published

July 14, 2021

Last Modified

August 10, 2026

Advisory Details (2)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, microsoft.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31979
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-2021-31979

Vendor Advisories for CVE-2021-31979(1)

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

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 103× in last 7d / 418× 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 1,533 total refreshes for this CVE.

  1. 2026-09-21 01:39 UTCVendor advisory
  2. 2026-09-21 01:39 UTCGHSA enrichment
  3. 2026-09-20 21:40 UTCEG score recompute
  4. 2026-09-20 21:40 UTCVendor advisory
  5. 2026-09-20 21:40 UTCGHSA enrichment
  6. 2026-09-20 20:12 UTCEPSS rescore
  7. 2026-09-20 17:40 UTCVendor advisory
  8. 2026-09-20 17:40 UTCGHSA enrichment
  9. 2026-09-20 13:40 UTCVendor advisory
  10. 2026-09-20 13:40 UTCGHSA enrichment
  11. 2026-09-20 09:42 UTCVendor advisory
  12. 2026-09-20 09:42 UTCGHSA enrichment
  13. 2026-09-20 05:43 UTCVendor advisory
  14. 2026-09-20 05:43 UTCGHSA enrichment
  15. 2026-09-20 01:44 UTCVendor advisory
  16. 2026-09-20 01:44 UTCGHSA enrichment
  17. 2026-09-19 21:45 UTCVendor advisory
  18. 2026-09-19 21:45 UTCGHSA enrichment
  19. 2026-09-19 17:46 UTCEG score recompute
  20. 2026-09-19 17:46 UTCVendor advisory
  21. 2026-09-19 17:46 UTCGHSA enrichment
  22. 2026-09-19 15:38 UTCEPSS rescore
  23. 2026-09-19 13:47 UTCVendor advisory
  24. 2026-09-19 13:47 UTCGHSA enrichment
  25. 2026-09-19 09:48 UTCVendor advisory
Show 75 more
  1. 2026-09-19 09:48 UTCGHSA enrichment
  2. 2026-09-19 05:49 UTCVendor advisory
  3. 2026-09-19 05:49 UTCGHSA enrichment
  4. 2026-09-19 01:50 UTCVendor advisory
  5. 2026-09-19 01:50 UTCGHSA enrichment
  6. 2026-09-18 21:52 UTCEG score recompute
  7. 2026-09-18 21:52 UTCVendor advisory
  8. 2026-09-18 21:51 UTCGHSA enrichment
  9. 2026-09-18 19:23 UTCEPSS rescore
  10. 2026-09-18 19:20 UTCCISA KEV update
  11. 2026-09-18 17:53 UTCVendor advisory
  12. 2026-09-18 17:53 UTCGHSA enrichment
  13. 2026-09-18 14:15 UTCCISA KEV update
  14. 2026-09-18 13:54 UTCVendor advisory
  15. 2026-09-18 13:54 UTCGHSA enrichment
  16. 2026-09-18 09:55 UTCVendor advisory
  17. 2026-09-18 09:55 UTCGHSA enrichment
  18. 2026-09-18 05:56 UTCVendor advisory
  19. 2026-09-18 05:55 UTCGHSA enrichment
  20. 2026-09-18 01:57 UTCVendor advisory
  21. 2026-09-18 01:57 UTCGHSA enrichment
  22. 2026-09-17 21:58 UTCEG score recompute
  23. 2026-09-17 21:58 UTCVendor advisory
  24. 2026-09-17 21:58 UTCGHSA enrichment
  25. 2026-09-17 19:23 UTCEPSS rescore
  26. 2026-09-17 19:23 UTCEPSS rescore
  27. 2026-09-17 17:58 UTCVendor advisory
  28. 2026-09-17 17:58 UTCGHSA enrichment
  29. 2026-09-17 13:59 UTCVendor advisory
  30. 2026-09-17 13:59 UTCGHSA enrichment
  31. 2026-09-17 10:00 UTCVendor advisory
  32. 2026-09-17 10:00 UTCGHSA enrichment
  33. 2026-09-17 06:01 UTCVendor advisory
  34. 2026-09-17 06:01 UTCGHSA enrichment
  35. 2026-09-17 02:02 UTCVendor advisory
  36. 2026-09-17 02:02 UTCGHSA enrichment
  37. 2026-09-16 22:03 UTCVendor advisory
  38. 2026-09-16 22:03 UTCGHSA enrichment
  39. 2026-09-16 18:05 UTCVendor advisory
  40. 2026-09-16 18:04 UTCGHSA enrichment
  41. 2026-09-16 14:10 UTCCISA KEV update
  42. 2026-09-16 14:05 UTCEG score recompute
  43. 2026-09-16 14:05 UTCVendor advisory
  44. 2026-09-16 14:05 UTCGHSA enrichment
  45. 2026-09-16 14:05 UTCEPSS rescore
  46. 2026-09-16 14:05 UTCEPSS rescore
  47. 2026-09-16 10:06 UTCVendor advisory
  48. 2026-09-16 10:06 UTCGHSA enrichment
  49. 2026-09-16 06:07 UTCEG score recompute
  50. 2026-09-16 06:07 UTCVendor advisory
  51. 2026-09-16 06:07 UTCGHSA enrichment
  52. 2026-09-16 02:08 UTCVendor advisory
  53. 2026-09-16 02:08 UTCGHSA enrichment
  54. 2026-09-15 22:09 UTCVendor advisory
  55. 2026-09-15 22:09 UTCGHSA enrichment
  56. 2026-09-15 18:10 UTCVendor advisory
  57. 2026-09-15 18:10 UTCGHSA enrichment
  58. 2026-09-15 14:11 UTCVendor advisory
  59. 2026-09-15 14:11 UTCGHSA enrichment
  60. 2026-09-15 10:12 UTCVendor advisory
  61. 2026-09-15 10:12 UTCGHSA enrichment
  62. 2026-09-15 06:12 UTCEG score recompute
  63. 2026-09-15 06:12 UTCVendor advisory
  64. 2026-09-15 06:12 UTCGHSA enrichment
  65. 2026-09-15 03:06 UTCEPSS rescore
  66. 2026-09-15 02:11 UTCVendor advisory
  67. 2026-09-15 02:11 UTCGHSA enrichment
  68. 2026-09-14 22:12 UTCVendor advisory
  69. 2026-09-14 22:12 UTCGHSA enrichment
  70. 2026-09-14 19:24 UTCCISA KEV update
  71. 2026-09-14 18:12 UTCVendor advisory
  72. 2026-09-14 18:11 UTCGHSA enrichment
  73. 2026-09-14 14:12 UTCVendor advisory
  74. 2026-09-14 14:12 UTCGHSA enrichment
  75. 2026-09-14 10:13 UTCVendor advisory

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Frequently asked(6)

What is CVE-2021-31979?
CVE-2021-31979 is a critical vulnerability published on July 14, 2021. Windows Kernel Elevation of Privilege Vulnerability
When was CVE-2021-31979 disclosed?
CVE-2021-31979 was first published in the National Vulnerability Database on July 14, 2021, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-31979 actively exploited?
Yes. CISA added CVE-2021-31979 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-31979?
CVE-2021-31979 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-31979?
CVE-2021-31979 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-31979?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31979, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2021-31979

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