CVE-2018-8298

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 2022-03-03), 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, nvd
Trending — 4 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: 75%CVSS: 7.5Exploit: cisa kev · ssvc active · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 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 ChakraCore scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8291, CVE-2018-8296.

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
75%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

July 11, 2018

Last Modified

October 28, 2025

Advisory Details (4)

Auto-updated Jun 6, 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-2018-8298
generic🟡 PoC Available

Microsoft Edge Chakra JIT - InitializeNumberFormat and InitializeDateTimeFormat Type Confusion - Windows dos Exploit

https://www.exploit-db.com/exploits/45217/
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-2018-8298
generic
http://www.securityfocus.com/bid/104639

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
Microsoft.ChakraCore1.10.0 ... 1.8.5 (34 versions)1.10.1—

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 38× in last 7d / 193× 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 382 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-45217✓ verified
    First seen Aug 17, 2018

    Microsoft Edge Chakra JIT - InitializeNumberFormat and InitializeDateTimeFormat Type Confusion

    Open source ↗

Frequently asked(6)

What is CVE-2018-8298?
CVE-2018-8298 is a critical vulnerability published on July 11, 2018. A remote code execution vulnerability exists in the way that the ChakraCore scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288,…
When was CVE-2018-8298 disclosed?
CVE-2018-8298 was first published in the National Vulnerability Database on July 11, 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-2018-8298 actively exploited?
Yes. CISA added CVE-2018-8298 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting ChakraCore ChakraCore scripting engine. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8298?
CVE-2018-8298 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-2018-8298?
CVE-2018-8298 affects ChakraCore ChakraCore 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-2018-8298?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8298, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-8298

Explore →

Is Your Infrastructure Affected by CVE-2018-8298?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs