CVE-2018-8373

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 62%CVSS: 7.5Exploit: cisa kev · ssvc active · epss top5pct · epss highExposed: 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 PROB
62%
EPSS %ILE
99%
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 96× in last 7d / 416× 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 1,345 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2018-8373?
CVE-2018-8373 is a critical 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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