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Known exploited vulnerability · CISA KEV

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

Microsoft Edge and Internet Explorer have a type confusion vulnerability in mshtml.dll, which allows remote code execution.

CVE-2017-0037

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-28: attackers are using it right now.

CISA KEV
Listed
Added 2022-03-28 · federal fix-by 2022-04-18
EPSS (30 days)
80%
Higher than 99.6% of CVEs · 2026-11-01
CVSS v3.1
8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

Microsoft Edge and Internet Explorer Type Confusion Vulnerability

Apply updates per vendor instructions.

NVD description · published 2017-02-26

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.

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How to check if you are exposed to CVE-2017-0037

  1. Find every Microsoft Edge and Internet Explorer system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2017-0037.

US federal agencies had to fix this by 2022-04-18. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2017-0037. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Microsoft Edgeall versions
Microsoft Internet Explorer11

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 1,856 days after it was published
  3. · Fix-by date for US federal agencies, passed 1,658 days ago

Weakness type

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CISA lists 390 exploited Microsoft vulnerabilities. The closest matches:

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Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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