CVE-2020-17087

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: 5%CVSS: 7.8Exploit: cisa kev · ssvc active · public exploitExposed: 0

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

Windows Kernel Local 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
5%
EPSS %ILE
92%
KEV
⚠ Exploited

Published

November 11, 2020

Last Modified

October 29, 2025

Advisory Details (2)

Auto-updated Jun 3, 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-2020-17087
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-2020-17087

Weakness Classification(3)

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 102× 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 1,492 total refreshes for this CVE.

  1. 2026-09-19 05:42 UTCVendor advisory
  2. 2026-09-19 05:41 UTCGHSA enrichment
  3. 2026-09-19 01:43 UTCVendor advisory
  4. 2026-09-19 01:43 UTCGHSA enrichment
  5. 2026-09-18 21:45 UTCEG score recompute
  6. 2026-09-18 21:45 UTCVendor advisory
  7. 2026-09-18 21:45 UTCGHSA enrichment
  8. 2026-09-18 19:23 UTCEPSS rescore
  9. 2026-09-18 19:20 UTCCISA KEV update
  10. 2026-09-18 17:47 UTCVendor advisory
  11. 2026-09-18 17:47 UTCGHSA enrichment
  12. 2026-09-18 14:15 UTCCISA KEV update
  13. 2026-09-18 13:49 UTCVendor advisory
  14. 2026-09-18 13:49 UTCGHSA enrichment
  15. 2026-09-18 09:51 UTCVendor advisory
  16. 2026-09-18 09:51 UTCGHSA enrichment
  17. 2026-09-18 05:53 UTCVendor advisory
  18. 2026-09-18 05:53 UTCGHSA enrichment
  19. 2026-09-18 01:55 UTCVendor advisory
  20. 2026-09-18 01:55 UTCGHSA enrichment
  21. 2026-09-17 21:57 UTCEG score recompute
  22. 2026-09-17 21:57 UTCVendor advisory
  23. 2026-09-17 21:57 UTCGHSA enrichment
  24. 2026-09-17 19:22 UTCEPSS rescore
  25. 2026-09-17 19:22 UTCEPSS rescore
Show 75 more
  1. 2026-09-17 17:59 UTCVendor advisory
  2. 2026-09-17 17:58 UTCGHSA enrichment
  3. 2026-09-17 14:00 UTCVendor advisory
  4. 2026-09-17 14:00 UTCGHSA enrichment
  5. 2026-09-17 10:02 UTCVendor advisory
  6. 2026-09-17 10:02 UTCGHSA enrichment
  7. 2026-09-17 06:04 UTCVendor advisory
  8. 2026-09-17 06:04 UTCGHSA enrichment
  9. 2026-09-17 02:06 UTCVendor advisory
  10. 2026-09-17 02:06 UTCGHSA enrichment
  11. 2026-09-16 22:08 UTCVendor advisory
  12. 2026-09-16 22:08 UTCGHSA enrichment
  13. 2026-09-16 18:10 UTCVendor advisory
  14. 2026-09-16 18:10 UTCGHSA enrichment
  15. 2026-09-16 14:12 UTCEG score recompute
  16. 2026-09-16 14:12 UTCVendor advisory
  17. 2026-09-16 14:12 UTCGHSA enrichment
  18. 2026-09-16 14:10 UTCCISA KEV update
  19. 2026-09-16 14:04 UTCEPSS rescore
  20. 2026-09-16 10:14 UTCVendor advisory
  21. 2026-09-16 10:14 UTCGHSA enrichment
  22. 2026-09-16 06:15 UTCEG score recompute
  23. 2026-09-16 06:15 UTCVendor advisory
  24. 2026-09-16 06:15 UTCGHSA enrichment
  25. 2026-09-16 02:18 UTCVendor advisory
  26. 2026-09-16 02:18 UTCGHSA enrichment
  27. 2026-09-15 22:20 UTCVendor advisory
  28. 2026-09-15 22:20 UTCGHSA enrichment
  29. 2026-09-15 18:22 UTCVendor advisory
  30. 2026-09-15 18:22 UTCGHSA enrichment
  31. 2026-09-15 14:24 UTCVendor advisory
  32. 2026-09-15 14:24 UTCGHSA enrichment
  33. 2026-09-15 10:26 UTCVendor advisory
  34. 2026-09-15 10:26 UTCGHSA enrichment
  35. 2026-09-15 06:27 UTCEG score recompute
  36. 2026-09-15 06:27 UTCVendor advisory
  37. 2026-09-15 06:27 UTCGHSA enrichment
  38. 2026-09-15 03:06 UTCEPSS rescore
  39. 2026-09-15 03:06 UTCEPSS rescore
  40. 2026-09-15 02:29 UTCGHSA enrichment
  41. 2026-09-14 22:28 UTCVendor advisory
  42. 2026-09-14 22:28 UTCGHSA enrichment
  43. 2026-09-14 19:24 UTCCISA KEV update
  44. 2026-09-14 18:30 UTCVendor advisory
  45. 2026-09-14 18:30 UTCGHSA enrichment
  46. 2026-09-14 14:32 UTCVendor advisory
  47. 2026-09-14 14:32 UTCGHSA enrichment
  48. 2026-09-14 10:35 UTCVendor advisory
  49. 2026-09-14 10:34 UTCGHSA enrichment
  50. 2026-09-14 06:36 UTCVendor advisory
  51. 2026-09-14 06:36 UTCGHSA enrichment
  52. 2026-09-14 02:39 UTCVendor advisory
  53. 2026-09-14 02:39 UTCGHSA enrichment
  54. 2026-09-13 22:41 UTCVendor advisory
  55. 2026-09-13 22:41 UTCGHSA enrichment
  56. 2026-09-13 18:44 UTCVendor advisory
  57. 2026-09-13 18:44 UTCGHSA enrichment
  58. 2026-09-13 14:46 UTCVendor advisory
  59. 2026-09-13 14:45 UTCGHSA enrichment
  60. 2026-09-13 10:47 UTCVendor advisory
  61. 2026-09-13 10:47 UTCGHSA enrichment
  62. 2026-09-13 06:48 UTCVendor advisory
  63. 2026-09-13 06:48 UTCGHSA enrichment
  64. 2026-09-13 02:50 UTCVendor advisory
  65. 2026-09-13 02:50 UTCGHSA enrichment
  66. 2026-09-12 22:53 UTCVendor advisory
  67. 2026-09-12 22:53 UTCGHSA enrichment
  68. 2026-09-12 18:55 UTCEG score recompute
  69. 2026-09-12 18:55 UTCVendor advisory
  70. 2026-09-12 18:55 UTCGHSA enrichment
  71. 2026-09-12 14:56 UTCEPSS rescore
  72. 2026-09-12 14:56 UTCVendor advisory
  73. 2026-09-12 14:56 UTCGHSA enrichment
  74. 2026-09-12 10:58 UTCVendor advisory
  75. 2026-09-12 10:58 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 PoCvp777/Windows-Non-Paged-Pool-Overflow-Exploitation
    First seen Jul 2, 2021

    Techniques based on named pipes for pool overflow exploitation targeting the most recent (and oldest) Windows versions demonstrated on CVE-2020-17087 and an off-by-one overflow

    Open source ↗
  • GitHub PoCrevengsh/CVE-2020-17087
    First seen Nov 26, 2020

    A CVE-2020-17087 PoC.

    Open source ↗

Frequently asked(6)

What is CVE-2020-17087?
CVE-2020-17087 is a critical vulnerability published on November 11, 2020. Windows Kernel Local Elevation of Privilege Vulnerability
When was CVE-2020-17087 disclosed?
CVE-2020-17087 was first published in the National Vulnerability Database on November 11, 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-2020-17087 actively exploited?
Yes. CISA added CVE-2020-17087 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-17087?
CVE-2020-17087 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-2020-17087?
CVE-2020-17087 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-2020-17087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-17087, 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-2020-17087

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