Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
https://github.com/envoyproxy/envoy/pull/14122
https://github.com/envoyproxy/envoy/issues/14113
https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1