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 92× in last 7d / 386× 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 677 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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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