Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:LA:L6.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L