# CVE-2009-20004

## Summary

- **CVE ID:** CVE-2009-20004
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:4.0/AV:L/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 21, 2025
- **Last Modified:** May 15, 2026

## Description

gAlan 0.2.1, a modular audio processing environment for Windows, is vulnerable to a stack-based buffer overflow when parsing .galan files. The application fails to properly validate the length of input data, allowing a specially crafted file to overwrite the stack and execute arbitrary code. Exploitation requires local interaction, typically by convincing a user to open the malicious file.

## Affected Products

- gAlan — gAlan (*)
- gAlan — gAlan (0)

## References

- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/galan_fileformat_bof.rb)
- [CNA](https://www.exploit-db.com/exploits/16664)
- [CNA](https://www.exploit-db.com/exploits/10345)
- [CNA](https://www.exploit-db.com/exploits/10339)
- [CNA](https://www.fortiguard.com/encyclopedia/ips/18034/galan-galan-file-stack-overflow)
- [CNA](https://web.archive.org/web/20101210055252/http://galan.sourceforge.net/)
- [CNA](https://www.vulncheck.com/advisories/galan-buffer-overflow)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 3.47%
- **EPSS Percentile:** 87.3

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