CVE-2021-21409

The CVE concerns Netty’s HTTP/2 codec (io.netty:netty-codec-http2) where, before version 4.1.61.Final, a Content-Length check can be bypassed when a single Http2HeaderFrame with endStream set to true is used. This enables HTTP request smuggling if the request is proxied and translated to HTTP/1.1...

CVE-2021-21295

Netty CVE-2021-21295 affects io.netty:netty-codec-http2 prior to 4.1.60.Final, where Content-Length validation can be bypassed when HTTP/2 is downgraded to HTTP/1.1 in proxied scenarios, enabling HTTP request smuggling. The issue occurs when HTTP2MultiplexCodec/Http2FrameCodec are used and Http2S...