Netatalk before 3.1.12 is vulnerable to an out of bounds write in dsi_opensess.c. This is due to lack of bounds checking on attacker controlled data. A remote unauthenticated attacker can leverage this vulnerability to achieve arbitrary code execution.
http://netatalk.sourceforge.net/3.1/ReleaseNotes3.1.12.html
http://packetstormsecurity.com/files/152440/QNAP-Netatalk-Authentication-Bypass.html
https://attachments.samba.org/attachment.cgi?id=14735
https://github.com/tenable/poc/tree/master/netatalk/cve_2018_1160/
https://www.debian.org/security/2018/dsa-4356
https://www.exploit-db.com/exploits/46034/
https://www.exploit-db.com/exploits/46048/