From the Changelog:<p>Multiple security improvements and fixes in packet parsing routines, DNA caching, and TCP sequence number and ID generation.<p>Disable NBNS and LLMNR by default.<p>Add TCP hang protection by default<p><a href="https://github.com/aws/amazon-freertos/blob/master/lib/FreeRTOS-Plus-TCP/source/History.txt" rel="nofollow">https://github.com/aws/amazon-freertos/blob/master/lib/FreeR...</a>