CVE-2017-0037: Microsoft Edge and Internet Explorer Type Confusion Vulnerability

High severity, CVSS 8.1. Actively exploited: in CISA KEV since 2022-03-28. EPSS: 80.4% chance of exploitation in the next 30 days.

Microsoft Internet Explorer 10 and 11 and Microsoft Edge have a type confusion issue in the Layout::MultiColumnBoxBuilder::HandleColumnBreakOnColumnSpanningElement function in mshtml.dll, which allows remote attackers to execute arbitrary code via vectors involving a crafted Cascading Style Sheets (CSS) token sequence and crafted JavaScript code that operates on a TH element.

Affected products

• Microsoft Edge: any version
• Microsoft Internet Explorer: version 11 only

Published 2017-02-26. Last modified 2026-06-17.