Stack-based Buffer Overflow in Belkin Bulldog Plus Web Service
CVE-2009-20009

9.3CRITICAL

Key Information:

Vendor

Belkin International, Inc.

Status
Bulldog Plus Ups Monitoring Software
Vendor
CVE Published:
30 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2009-20009?

Belkin Bulldog Plus version 4.0.2 build 1219 is vulnerable to a stack-based buffer overflow due to improper validation of the Authorization header in its web service authentication handler. When a maliciously crafted HTTP request is sent with an oversized header, the application fails to enforce input length restrictions, leading to memory corruption. This flaw can be exploited remotely without the need for prior authentication, allowing an attacker potential control over the affected system.

Affected Version(s)

Bulldog Plus UPS Monitoring Software * <= 4.0.2 build 1219

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2009-20009 - Proof of Concept

CVE-2009-20009 - Proof of Concept

References

https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://www.exploit-db.com/exploits/8173
exploit
https://www.fortiguard.com/encyclopedia/ips/17325/belkin-...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Elazar
.
CVE-2009-20009 : Stack-based Buffer Overflow in Belkin Bulldog Plus Web Service