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 — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 5.4%CVSS: 7.8Exploit: cisa kev · ssvc active · public exploitExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Windows Kernel Local 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 referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
5.4%
EPSS %ILE
92nd
KEV
⚠ Exploited

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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

November 11, 2020

Last Modified

October 29, 2025

Advisory Details (2)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. Fix referenced — no release confirmed yet. Sources: microsoft, cisa.
cisa🔴 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
microsoftMentions a patch (unverified)

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

Vendor Advisories for CVE-2020-17087(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 96× in last 7d / 419× 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 1,784 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

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 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 attention. A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
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 (CRITICAL).
Which products are affected by CVE-2020-17087?
CVE-2020-17087 affects Microsoft Windows.
How do I remediate CVE-2020-17087?
A fix for CVE-2020-17087 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2020-17087 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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