CVE-2025-4321 DoS in RS9116W-WiSeConnect L2CAP protocol due to reception of malformed packets
Attackers can cause a denial of service in RS9116W Bluetooth devices by sending malformed L2CAP packets, requiring a hard reset to recover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-4321?
CVE-2025-4321 is a high-severity denial of service vulnerability in silabs.com RS9116W, published on 17 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In a Bluetooth device, using RS9116-WiseConnect SDK experiences a Denial of Service, if it receives malformed L2CAP packets, only hard reset will bring the device to normal operation
Which versions are affected by CVE-2025-4321?
How do I fix CVE-2025-4321?
No fix has been published for CVE-2025-4321 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-4321 being exploited?
There is no known exploitation of CVE-2025-4321 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-5hr4-696x-x4hr.