Belkin Bulldog Plus UPS Monitoring Software up to 4.0.2 Web Service stack-based overflow

Summaryinfo

A vulnerability was found in Belkin Bulldog Plus UPS Monitoring Software up to 4.0.2. It has been classified as critical. Impacted is an unknown function of the component Web Service. The manipulation leads to stack-based overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is traded as CVE-2009-20009. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Belkin Bulldog Plus UPS Monitoring Software up to 4.0.2. It has been rated as very critical. This issue affects an unknown code block of the component Web Service. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by Elazar. It is possible to read the advisory at raw.githubusercontent.com. The identification of this vulnerability is CVE-2009-20009 since 08/28/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/31/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2009-5122). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Belkin

Name

• Bulldog Plus UPS Monitoring Software

Version

• 4.0.0
• 4.0.1
• 4.0.2

License

• commercial

Support

• end of life

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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