CVE-2018-8440

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 2022-03-28), 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: 18%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomware · Metasploit · epss top5pct · 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 when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

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
18%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

September 13, 2018

Last Modified

October 28, 2025

Advisory Details (5)

Auto-updated Jun 3, 2026
🔬 Proof of concept available. Patch available. Sources: microsoft.
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-2018-8440
generic🟡 PoC Available

Comparing Our Micropatch With Microsoft's Official Patch For CVE-2018-8440

https://blog.0patch.com/2018/09/comparing-our-micropatch-with.html
generic🟡 PoC Available

How We Micropatched a Publicly Dropped 0day in Task Scheduler (CVE-2018-8440)

https://blog.0patch.com/2018/08/how-we-micropatched-publicly-dropped.html
generic
http://www.securitytracker.com/id/1041578
generic
http://www.securityfocus.com/bid/105153

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 / 352× 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 1,029 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

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

  • GitHub PoCsourceincite/CVE-2018-8440
    First seen Oct 31, 2018

    CVE-2018-8440 standalone exploit

    Open source ↗
  • Metasploitexploit/windows/local/alpc_taskscheduler✓ verified
    First seen Aug 27, 2018

    Microsoft Windows ALPC Task Scheduler Local Privilege Elevation

    Open source ↗

Related CVEs(same vendor)

Frequently asked(6)

What is CVE-2018-8440?
CVE-2018-8440 is a critical vulnerability published on September 13, 2018. An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows…
When was CVE-2018-8440 disclosed?
CVE-2018-8440 was first published in the National Vulnerability Database on September 13, 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-2018-8440 actively exploited?
Yes. CISA added CVE-2018-8440 to the Known Exploited Vulnerabilities catalog on March 28, 2022, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8440?
CVE-2018-8440 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-2018-8440?
CVE-2018-8440 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-2018-8440?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8440, 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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