CVE-2020-17144

CRITICALNVD 8.49.0▲
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 8.4 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: 37%CVSS: 8.4Exploit: 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.

Microsoft Exchange Remote Code Execution Vulnerability

CVSS v3
8.4
EG Score
9.0(high)
EG Risk
96(Act)
EG Risk 96/100SSVC: Act

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%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
37%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

December 10, 2020

Last Modified

October 29, 2025

Advisory Details (3)

Auto-updated Jun 2, 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-2020-17144
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-2020-17144
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144

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 98× in last 7d / 402× 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 1,417 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCAirboi/CVE-2020-17144-EXP
    First seen Dec 9, 2020

    Exchange2010 authorized RCE

    Open source ↗
  • GitHub PoCzcgonvh/CVE-2020-17144
    First seen Dec 9, 2020

    weaponized tool for CVE-2020-17144

    Open source ↗

Frequently asked(6)

What is CVE-2020-17144?
CVE-2020-17144 is a critical vulnerability published on December 10, 2020. Microsoft Exchange Remote Code Execution Vulnerability
When was CVE-2020-17144 disclosed?
CVE-2020-17144 was first published in the National Vulnerability Database on December 10, 2020, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-17144 actively exploited?
Yes. CISA added CVE-2020-17144 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Exchange Server. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-17144?
CVE-2020-17144 has a CVSS v3 base score of 8.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-17144?
CVE-2020-17144 affects Microsoft Exchange Server. 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-2020-17144?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-17144, 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

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