CVE-2021-34486

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 2022-03-28), 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: 9%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

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

Windows Event Tracing 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
9%
EPSS %ILE
95%
KEV
⚠ Exploited

Published

August 12, 2021

Last Modified

August 10, 2026

Advisory Details (2)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
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-2021-34486
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-2021-34486

Vendor Advisories for CVE-2021-34486(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 101× in last 7d / 416× 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 1,519 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCKaLendsi/CVE-2021-34486
    First seen Oct 12, 2021

    Windows Etw LPE

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-34486?
CVE-2021-34486 is a critical vulnerability published on August 12, 2021. Windows Event Tracing Elevation of Privilege Vulnerability
When was CVE-2021-34486 disclosed?
CVE-2021-34486 was first published in the National Vulnerability Database on August 12, 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-2021-34486 actively exploited?
Yes. CISA added CVE-2021-34486 to the Known Exploited Vulnerabilities catalog on March 28, 2022, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-34486?
CVE-2021-34486 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-2021-34486?
CVE-2021-34486 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-2021-34486?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-34486, 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-2021-34486

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