CVE-2009-20009 CRITICAL

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

Vendor Belkin International, Inc.
Product Bulldog Plus UPS Monitoring Software
Weakness CWE-121
Published August 30, 2025
Last update May 15, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 30, 2025 CVE published
May 15, 2026 Record updated