This indicates an attack attempt to exploit an Out Of Bounds Write vulnerability in Netatalk.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted request. A remote attacker may be able to exploit this to execute arbitrary code, via a crafted DSI OpenSession command.
Netatalk Netatalk prior to 3.1.12
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: