Hello,
We recently discovered a vulnerability within MTA Server, as a result of which an attacker could crash your server. The issue has been fixed and we urge all server owners and hosters to update immediately.
Getting the update
Linux: https://linux.multitheftauto.com/
Windows x64: https://nightly.multitheftauto.com/?mtasa_x64-1.5-rc-latest
If your server is hosted locally (out of your MTA installation folder), reinstall with the full installer from https://multitheftauto.com/ for the x86 server