# CVE-2009-20009

## Summary

- **CVE ID:** CVE-2009-20009
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121
- **Published:** Aug 30, 2025
- **Last Modified:** May 15, 2026

## Description

Belkin Bulldog Plus version 4.0.2 build 1219 contains a stack-based buffer overflow vulnerability in its web service authentication handler. When a specially crafted HTTP request is sent with an oversized Authorization header, the application fails to properly validate the input length before copying it into a fixed-size buffer, resulting in memory corruption and potential remote code execution. Exploitation requires network access and does not require prior authentication.

## Affected Products

- Belkin International, Inc. — Bulldog Plus UPS Monitoring Software (*)
- Belkin International, Inc. — Bulldog Plus UPS Monitoring Software (0)

## References

- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/belkin_bulldog.rb)
- [CNA](https://www.exploit-db.com/exploits/8173)
- [CNA](https://www.fortiguard.com/encyclopedia/ips/17325/belkin-bulldog-plus-web-services-buffer-overflow)
- [CNA](https://s3.belkin.com/support/dl/bulldogwindows.pdf)
- [CNA](https://www.vulncheck.com/advisories/belkin-bulldog-plus-web-service-buffer-overflow)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 62.60%
- **EPSS Percentile:** 98.3

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