According to the latest Akamai security report, distributed denial of service attacks have almost doubled in the second quarter of 2015, in comparison with the same time last year.
The report said that while attackers favoured less powerful but longer duration attacks during the second quarter of this year, the number of dangerous "mega attacks" continued to rise.
According to the report, the financial and retail sectors continued to be the most highly targeted by DDoS attacks.
In the quarter from April to June there were 12 DDoS attacks peaking at more than 100 gigabits per second (Gbps) and five attacks peaking at more than 50 million packets per second (Mpps).
The report said there are very few organisations that have the capacity to cope with such attacks on their own.
DDoS attack activity was up 132% compared with the same quarter last year, and up 7% on the previous quarter.
The report highlighted that exploitation of the Shellshock vulnerability was used in 49% of web application attacks in the quarter.
Aside from Shellshock, SQL attacks accounted for 26% of all attacks, which was up 75% on the previous quarter.
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