handle_ipDefaultTTL in agent/mibgroup/ip-mib/ip_scalars.c in Net-SNMP 5.8 through 5.9.3 has a NULL Pointer Exception bug that can be used by a remote attacker (who has write access) to cause the instance to crash via a crafted UDP packet, resulting in Denial of Service.
https://security.netapp.com/advisory/ntap-20230223-0011/
https://lists.debian.org/debian-lts-announce/2023/01/msg00010.html