May I ask who’s calling, please? A recent rise in VoIP DDoS attacks - The Cloudflare Blog
The graph below shows a recent multi-vector UDP DDoS attack that targeted VoIP infrastructure protected by Cloudflare’s Magic Transit service. The attack peaked just above 70 Gbps and 16M packets per second. While it’s not the largest attack we’ve ever seen, attacks of this size can have large impact on unprotected infrastructure. This specific attack lasted a bit over 10 hours and was automatically detected and mitigated.
Below are two additional graphs of similar attacks seen last week against SIP infrastructure. In the first chart we see multiple protocols being used to launch the attack, with the bulk of traffic coming from (spoofed) DNS reflection and other common amplification and reflection vectors. These attacks peaked at over 130 Gbps and 17.4M pps.
