Exploited CVEs / Microsoft / CVE-2018-8373
CVE-2018-8373
Microsoft Scripting Engine Memory Corruption Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-04-15 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Microsoft Security Update Guide (MSRC), linked below.
Risk summary
Actively exploited Microsoft Internet Explorer Scripting Engine vulnerability. Added to the CISA KEV catalog 2022-03-25.
Senserva AI Opinion for CVE-2018-8373
Internet Explorer's scripting engine mishandles objects in memory, giving remote code execution from a booby-trapped web page, and this one was caught being exploited as a zero-day before Microsoft patched it. IE is retired as a browser, but its engine persists through IE mode and embedded controls in line-of-business apps, which keeps High Severity flaws like this relevant on legacy fleets. The KEV listing confirms real-world use.
Do this: Apply the August 2018 updates to any host that still loads the IE scripting engine and restrict IE mode to an allowlist of internal sites.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2018-8373
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2018-8373
- Published
- 2022-03-25
- Last revised
- 2022-03-25
- Changes tracked
- 1
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal remediation due date: 2022-04-15 (past due).
Official fix for CVE-2018-8373
The authoritative fix and affected-version list are published by the vendor. Find the Internet Explorer Scripting Engine advisory on Microsoft Security Update Guide (MSRC).
Common questions about CVE-2018-8373
Is CVE-2018-8373 actively exploited?
Yes. CVE-2018-8373 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-03-25, which means exploitation in the wild has been confirmed, not predicted.
What is the CISA deadline and required action for CVE-2018-8373?
CISA set the federal remediation due date at 2022-04-15, which has passed; treat any unremediated system as overdue.
What fixes CVE-2018-8373?
The authoritative fix is in the vendor advisory: see Microsoft Security Update Guide (MSRC) for the patched Internet Explorer Scripting Engine versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2018-8373?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2018-8373's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (morning and afternoon US Central).
Scope and sources
- More exploited Microsoft CVEs
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All Microsoft exploited CVEs on one page: Microsoft vulnerabilities actively exploited.
- Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.