---
id: "CVE-2018-8373"
kind: "vulnerability"
aliases: ["CVE-2018-8373"]
title: "Microsoft Internet Explorer Scripting Engine: Microsoft Scripting Engine Memory Corruption Vulnerability"
severity: "high"
cvss: 7.6
epss: 0.61511
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Internet Explorer Scripting Engine", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "internet-explorer", "windows"]
not_affected_if: ["no-internet-explorer-installed"]
published_at: "2018-08-15T17:29:06+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-8373", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-8373", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-8373", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Microsoft Internet Explorer Scripting Engine: Microsoft Scripting Engine Memory Corruption Vulnerability

A memory corruption flaw in the Internet Explorer scripting engine lets a crafted web page run code. CISA lists it as actively exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Internet Explorer Scripting Engine affected ? fixed ?

## Fix

Apply the Microsoft updates for this CVE per vendor instructions; the specific patched builds are not stated in the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-8373
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2018-8373
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-8373

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_