CVE-2009-20009 Belkin Bulldog Plus Web Service Buffer Overflow
Remote attackers can execute arbitrary code on Belkin Bulldog Plus via a stack-based buffer overflow in the web service authentication handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2009-20009?
CVE-2009-20009 is a critical memory corruption vulnerability in Belkin International, Inc. Bulldog Plus UPS Monitoring Software, published on 30 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2009-20009?
How do I fix CVE-2009-20009?
No fix has been published for CVE-2009-20009 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2009-20009 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-20009 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-9gqw-88p3-59j6.