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CVE-2018-8373

Microsoft Scripting Engine Memory Corruption Vulnerability

  • High 7.5
  • Exploited: added to CISA KEV 25 Mar 2022

Description

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.

Key facts

Published
15 Aug 2018
Last changed
21 Oct 2025
Assigned by
microsoft
KEV added
25 Mar 2022
KEV fix due
15 Apr 2022
EPSS
61.77% likely to be exploited in the next 30 days, higher than 99.188% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.5CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
MicrosoftInternet Explorer 9
  • Windows Server 2008 for 32-bit Systems Service Pack 2 (affected)
  • Windows Server 2008 for x64-based Systems Service Pack 2 (affected)
MicrosoftInternet Explorer 11
  • Windows 10 for 32-bit Systems (affected)
  • Windows 10 for x64-based Systems (affected)
  • Windows 10 Version 1607 for 32-bit Systems (affected)
  • Windows 10 Version 1607 for x64-based Systems (affected)
  • Windows 10 Version 1703 for 32-bit Systems (affected)
  • Windows 10 Version 1703 for x64-based Systems (affected)
  • Windows 10 Version 1709 for 32-bit Systems (affected)
  • Windows 10 Version 1709 for x64-based Systems (affected)
  • Windows 10 Version 1803 for 32-bit Systems (affected)
  • Windows 10 Version 1803 for x64-based Systems (affected)
  • Windows 7 for 32-bit Systems Service Pack 1 (affected)
  • Windows 7 for x64-based Systems Service Pack 1 (affected)
  • Windows 8.1 for 32-bit systems (affected)
  • Windows 8.1 for x64-based systems (affected)
  • Windows RT 8.1 (affected)
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (affected)
  • Windows Server 2012 R2 (affected)
  • Windows Server 2016 (affected)
MicrosoftInternet Explorer 10
  • Windows Server 2012 (affected)

Timeline

  1. 15 Aug 2018 Published
  2. 25 Mar 2022 CVE-2018-8373 added to CISA KEV
  3. 25 Mar 2022 Added to the CISA KEV catalogue

Weakness

References