High 7.5Known exploited (CISA KEV)Published Aug 15, 2018

CVE-2018-8373A 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…

Updated under an hour ago (2026-10-19 09:30 UTC)

Does this affect you?

It affects Microsoft Internet Explorer 9 and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 25, 2022; federal agencies had to remediate by Apr 15, 2022. Treat that date as your deadline.

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Every CVE for Microsoft Internet Explorer 9

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Mar 25, 2022; federal remediation due Apr 15, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 61.91% (percentile 99)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Internet Explorer 9 microsoft:internet_explorer_9 (from the name)	Windows Server 2008 for 32-bit Systems Service Pack 2; Windows Server 2008 for x64-based Systems Service Pack 2	CNA record
Microsoft Internet Explorer 11 microsoft:internet_explorer_11 (from the name)	Windows 10 for 32-bit Systems; Windows 10 for x64-based Systems; Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1703 for 32-bit Systems; Windows 10 Version 1703 for x64-based Systems; Windows 10 Version 1709 for 32-bit Systems; Windows 10 Version 1709 for x64-based Systems; and 10 more ranges	CNA record
Microsoft Internet Explorer 10 microsoft:internet_explorer_10 (from the name)	Windows Server 2012	CNA record
microsoft internet_explorer microsoft:internet_explorer	11; 10; 9	NVD

References

http://www.securitytracker.com/id/1041483vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
http://www.securityfocus.com/bid/105037vdb-entry, x-refsource-bid, broken-link, third-party-advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8373x-refsource-confirm, patch, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8373us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.