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Start for freeio.netty:netty-codec-http2 vulnerable to HTTP/2 Rapid Reset Attack
A client might overload the server by issue frequent RST frames. This can cause a massive amount of load on the remote system and so cause a DDOS attack.
This is a DDOS attack, any http2 server is affected and so you should update as soon as possible.
This is patched in version 4.1.100.Final.
A user can limit the amount of RST frames that are accepted per connection over a timeframe manually using either an own Http2FrameListener implementation or an ChannelInboundHandler implementation (depending which http2 API is used).