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: 2.7%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

Open Management Infrastructure Elevation of Privilege Vulnerability

CVSS v3
7.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.
EPSS PROB
2.7%
EPSS %ILE
85th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 15, 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-2021-38645
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

Vendor Advisories for CVE-2021-38645(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 93× in last 7d / 395× 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 1,603 total refreshes for this CVE.

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

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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 on September 15, 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-2021-38645 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 attention. A fix is available. Apply it.
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 (CRITICAL).
Which products are affected by CVE-2021-38645?
CVE-2021-38645 affects Microsoft Open Management Infrastructure (OMI).
How do I remediate CVE-2021-38645?
A fix for CVE-2021-38645 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-38645 are linked in the Vendor Advisories panel on this page.

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