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: 19%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
19%
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 96× in last 7d / 413× 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 1,349 total refreshes for this CVE.

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

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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