CVE-2019-0859

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 — 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: 4%CVSS: 7.8Exploit: cisa kev · ssvc active · public exploitExposed: 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 CVE ID is unique from CVE-2019-0685, CVE-2019-0803.

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
4%
EPSS %ILE
90%
KEV
⚠ Exploited

Published

April 9, 2019

Last Modified

October 29, 2025

Advisory Details (2)

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-2019-0859
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-2019-0859

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 93× in last 7d / 348× 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 1,026 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCSheisback/CVE-2019-0859-1day-Exploit
    First seen Jun 7, 2019

    CVE-2019-0859 1day Exploit

    Open source ↗

Frequently asked(6)

What is CVE-2019-0859?
CVE-2019-0859 is a critical vulnerability published on April 9, 2019. 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 CVE ID is unique from CVE-2019-0685, CVE-2019-0803.
When was CVE-2019-0859 disclosed?
CVE-2019-0859 was first published in the National Vulnerability Database on April 9, 2019, 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-2019-0859 actively exploited?
Yes. CISA added CVE-2019-0859 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Win32k. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-0859?
CVE-2019-0859 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-2019-0859?
CVE-2019-0859 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-2019-0859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-0859, 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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