Mikrotik RouterOS before 6.44.5 (long-term release tree) is vulnerable to memory exhaustion. By sending a crafted HTTP request, an authenticated remote attacker can crash the HTTP server and in some circumstances reboot the system. Malicious code cannot be injected.
https://seclists.org/fulldisclosure/2019/Jul/20
http://packetstormsecurity.com/files/153733/Mikrotik-RouterOS-Resource-Stack-Exhaustion.html