CVE-2018-8639

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 2025-03-03), 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 22%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 in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8641.

CVSS v3
7.8
EG Score
9.0(high)
EPSS
97.4%
KEV
⚠ Exploited

Published

December 12, 2018

Last Modified

October 29, 2025

Advisory Details (3)

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-2018-8639
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-2018-8639
generic
http://www.securityfocus.com/bid/106093

Weakness Classification(1)

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 132× in last 7d / 541× 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 769 total refreshes for this CVE.

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

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 PoCtimwhitez/CVE-2018-8639-EXP
    First seen Dec 27, 2019

    CVE-2018-8639-EXP

    Open source ↗
  • GitHub PoCze0r/CVE-2018-8639-exp
    First seen Mar 5, 2019
    Open source ↗

Frequently asked(6)

What is CVE-2018-8639?
CVE-2018-8639 is a high vulnerability published on December 12, 2018. An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server…
When was CVE-2018-8639 disclosed?
CVE-2018-8639 was first published in the National Vulnerability Database on December 12, 2018, 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-2018-8639 actively exploited?
Yes. CISA added CVE-2018-8639 to the Known Exploited Vulnerabilities catalog on March 3, 2025, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8639?
CVE-2018-8639 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-2018-8639?
CVE-2018-8639 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-2018-8639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8639, 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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