CVE-2018-8373

HIGHNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 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
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 54%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.

CVSS v3
7.5
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
98.9%
KEV
⚠ Exploited

Published

August 15, 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-2018-8373
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-2018-8373
generic
http://www.securitytracker.com/id/1041483
generic
http://www.securityfocus.com/bid/105037

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 84× in last 7d / 400× 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 733 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2018-8373?
CVE-2018-8373 is a high vulnerability published on August 15, 2018. A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from…
When was CVE-2018-8373 disclosed?
CVE-2018-8373 was first published in the National Vulnerability Database on August 15, 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-2018-8373 actively exploited?
Yes. CISA added CVE-2018-8373 to the Known Exploited Vulnerabilities catalog on March 25, 2022, affecting Microsoft Internet Explorer Scripting Engine. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8373?
CVE-2018-8373 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-8373?
CVE-2018-8373 affects Microsoft Internet Explorer Scripting Engine. 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-2018-8373?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8373, 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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