In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero.
Exploitability
AV:AAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:L4.3/CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LOther