Author of OpenSSL vulnerability also wrote the spec
https://github.com/openssl/openssl/commit/bd6941cfaa31ee8a3f8661cb98227a5cbcc0f9f3Link to the TLS/DTLS heartbeat spec: https://tools.ietf.org/html/draft-seggelmann-tls-dtls-heartbeat-01
Link to the TLS/DTLS heartbeat spec: https://tools.ietf.org/html/draft-seggelmann-tls-dtls-heartbeat-01