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

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 Casc

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Microsoft Corporation	Internet Browser	Internet Explorer 10 and 11 and Edge

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-03-28. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-02-26T23:30:00.000Z
• Last modified: 2025-10-21T23:55:46.410Z
• Added to CISA KEV: 2022-03-28
• BOD 22-01 due: 2022-04-18

09References

• bugs.chromium.org — https://bugs.chromium.org/p/project-zero/issues/detail?id=1011
• 0patch.blogspot.si — https://0patch.blogspot.si/2017/03/0patching-another-0-day-internet.html
• www.securityfocus.com — http://www.securityfocus.com/bid/96088
• www.exploit-db.com — https://www.exploit-db.com/exploits/41454/
• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0037
• www.exploit-db.com — https://www.exploit-db.com/exploits/43125/
• www.securitytracker.com — http://www.securitytracker.com/id/1037905
• www.exploit-db.com — https://www.exploit-db.com/exploits/42354/
• www.securitytracker.com — http://www.securitytracker.com/id/1037906