# CVE-2009-20008

## Summary

- **CVE ID:** CVE-2009-20008
- **Severity:** HIGH
- **CVSS Score:** 8.6 (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)
- **CWE:** CWE-121
- **Published:** Aug 30, 2025
- **Last Modified:** May 25, 2026

## 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.

## Affected Products

- Zhengzhou Jinhui Computer System Engineering Co. Ltd. ; Beijing Dazheng Human Language Technology Academy — Green Dam Youth Escort (*)
- Zhengzhou Jinhui Computer System Engineering Co. Ltd. ; Beijing Dazheng Human Language Technology Academy — Green Dam Youth Escort (0)
- Zhengzhou Jinhui Computer System Engineering Co. Ltd. ; Beijing Dazheng Human Language Technology Academy — Green Dam Youth Escort (3.17)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 42.08%
- **EPSS Percentile:** 97.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._