CVE-2021-38645

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: 2%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.

Open Management Infrastructure 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
2%
EPSS %ILE
77%
KEV
⚠ Exploited

Published

September 15, 2021

Last Modified

October 30, 2025

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-2021-38645
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-2021-38645

Weakness Classification(1)

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 61× in last 7d / 355× 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 739 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-38645?
CVE-2021-38645 is a critical vulnerability published on September 15, 2021. Open Management Infrastructure Elevation of Privilege Vulnerability
When was CVE-2021-38645 disclosed?
CVE-2021-38645 was first published in the National Vulnerability Database on September 15, 2021, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-38645 actively exploited?
Yes. CISA added CVE-2021-38645 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Open Management Infrastructure (OMI). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-38645?
CVE-2021-38645 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-2021-38645?
CVE-2021-38645 affects Microsoft Open Management Infrastructure (OMI). 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-2021-38645?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38645, 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.

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