CVE-2018-8589

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 2022-05-23), 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: 3%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.

An elevation of privilege vulnerability exists when Windows improperly handles calls to Win32k.sys, aka "Windows Win32k Elevation of Privilege Vulnerability." This affects Windows Server 2008, Windows 7, Windows Server 2008 R2.

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
3%
EPSS %ILE
86%
KEV
⚠ Exploited

Published

November 14, 2018

Last Modified

October 28, 2025

Advisory Details (4)

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-2018-8589
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-2018-8589
generic
http://www.securitytracker.com/id/1042140
generic
http://www.securityfocus.com/bid/105796

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 91× in last 7d / 344× 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 1,008 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2018-8589?
CVE-2018-8589 is a critical vulnerability published on November 14, 2018. An elevation of privilege vulnerability exists when Windows improperly handles calls to Win32k.sys, aka "Windows Win32k Elevation of Privilege Vulnerability." This affects Windows Server 2008, Windows 7, Windows Server 2008 R2.
When was CVE-2018-8589 disclosed?
CVE-2018-8589 was first published in the National Vulnerability Database on November 14, 2018, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-8589 actively exploited?
Yes. CISA added CVE-2018-8589 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Microsoft Win32k. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8589?
CVE-2018-8589 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-2018-8589?
CVE-2018-8589 affects Microsoft Win32k. 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-2018-8589?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8589, 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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