CVE-2021-41379

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 2022-03-03), 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: 20%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed: 0

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

Windows Installer 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
20%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

November 10, 2021

Last Modified

August 19, 2026

Advisory Details (3)

Auto-updated Jun 13, 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-2021-41379
generic

ZDI-21-1308 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
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-2021-41379

Vendor Advisories for CVE-2021-41379(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 / 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 1,508 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-41379?
CVE-2021-41379 is a critical vulnerability published on November 10, 2021. Windows Installer Elevation of Privilege Vulnerability
When was CVE-2021-41379 disclosed?
CVE-2021-41379 was first published in the National Vulnerability Database on November 10, 2021, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-41379 actively exploited?
Yes. CISA added CVE-2021-41379 to the Known Exploited Vulnerabilities catalog on March 3, 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-2021-41379?
CVE-2021-41379 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-2021-41379?
CVE-2021-41379 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-2021-41379?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-41379, 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-2021-41379

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