What’s Vulnerable › Vulnerabilities

CVE-2009-20009: Belkin Bulldog Plus Web Service Buffer Overflow

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-30 · updated 2026-10-01
• Weakness: CWE-121

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: through 4.0.2 build 1219

References

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

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