DO NOT BUY if you plan to play multiplayer or zombies with friends.

There are RCE vulnerabilities which I expirienced myself while playing solo zombies. After uninstalling, it didn't happen again. A chinese IP was trying to install a trojan remotely through BO3.

Be really careful. Treyarch and Activision don't care at all about games which are not the latest ones (you could even argue if they do in that case).

Sci-Fi Call of Duty similar to infinity warfare. Only wish the cutscenes were skippable after the first play through.

My thoughts are this. Funny enough, I ♥♥♥♥♥♥♥ love Black Ops 3. One of my favorite cod games, third to bo1 and 2 (no joke intended). But Activision refuses to fix the ever looming RAT/RCE exploit within all cod games 2018 and below. Here is some information for those who are confused. And yes, this applies to EVERY cod 2018 and below. MW 2019 and up (beside Cold War, which is unsafe), are okay to play. *Note I did not research and write this myself, I do not take credit for finding this info*

DO NOT OPEN ANY COD PRIOR TO IW
They took away Xlabs, Sm2, and soon will take away Plutonium which are all the ONLY safe way to play these older CoDs.
Opening any CoD prior to IW will result in a chance for people to gain access to your pc. 2 security breaches are known:
CVE-2018-20817
(SV_SteamAuthClient in various Activision Infinity Ward Call of Duty games before 2015-08-11 is missing a size check when reading authBlob data into a buffer, which allows one to execute code on the remote target machine when sending a steam authentication request. This affects Call of Duty: Modern Warfare 2, Call of Duty: Modern Warfare 3, Call of Duty: Ghosts, Call of Duty: Advanced Warfare, Call of Duty: Black Ops 1, and Call of Duty: Black Ops 2.)
CVE-2018-10718
(Stack-based buffer overflow in Activision Infinity Ward Call of Duty Modern Warfare 2 before 2018-04-26 allows remote attackers to execute arbitrary code via crafted packets)
These are some things they can do even if you just boot up the game and get to the menu:
Hidden Remote System Access
System Information
File Manager
Hidden Desktop Usage
Monitor on/off
Hidden Browser Usage
Open/close CD
Hidden Chrome Usage
Show/Hide taskbar
Start Up Manager
Hidden Firefox Usage
Show/Hide Start Button
Task Manager
Hidden Edge Usage
Show/Hide Explorer
Remote Shell Usage
Show/Hide Clock
TCP Connection
Show/Hide Tray
Reverse Proxy
Show/Hide Mouse
Registry Editor
Hidden Explorer
Enable/Disable TaskMgr
UAC Exploit
Enable/Disable Regedit
Disable WD
Disable UAC
Format All Drives
DDOS attack
Audio recording
Webcam recording
Device information
Process hollowing
Credential stealing
Discord token stealing