Any mitigation device correctly configured to handle UDP Garbage floods should have no issues mitigating a CoAP flood.
- The attack is made of a large quantity of UDP packets.
- Those packets can contain a fair amount of data.
- Most non-IoT devices will not know how to process this data, effectively making it into a UDP Garbage Flood.
You might have figured it out already, but a CoAP flood is little more than a hyped up UDP Garbage Flood. Most importantly, any mitigation device correctly configured to handle UDP Garbage floods should have no issues mitigating a CoAP flood.
So bottom line - CoAP is an easy way for attackers to generate a large UDP DDoS attack, but if you've already verified that DDoS mitigation blocks UDP attack traffic, you should have nothing to worry about.
Not that sure?
Learn more about testing your environment against the most common DDoS Attack vectors here.