DDoS Attacks Fell 13% in 2021


While the number and average size of DDoS attacks fell in 2021 over 2020, the threat level is still very high when compared to pre-pandemic levels. Attack vectors are also in flux, because while UDP attacks are still the most common, TCP ACK, which can exponentially amplify the effect of a DDoS event with a small amount of traffic, rose significantly. Organizations need to be prepared to deal with a wide array of vectors — DDoS remains a persistent, elevated threat.

Key Observations from the DDoS Statistical Report for 2021 reveals:

  • In 2021, the total attack count and average attack size both fell by 13.32% and 50.00% respectively compared to the figures registered in 2020.
  • Compared to 2020, the maximum attack size increased by 296.62%, with the maximum attack size clocking in at 699.20 Gbps.
  • UDP based attacks, while remaining the most predominant type of attack in 2021, decreased by 38.28% YoY. The number of TCP based, ICMP based and other attacks however, increased over the same period a year ago.

Download our DDoS Statistical Report for 2021 for more information on attack vectors, stats and trends.

You can read the full report here.