CVE-2018-8589

HIGHNVD 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 3%CVSS: 7.8Exploit: NoneExposed: 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)
EPSS
85.9%
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 127× in last 7d / 525× 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 671 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-8589?
CVE-2018-8589 is a high 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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