I have not had this .exe version issue. My game is fine. Please could someone explain the risk mentioned in other games? Thankyou.
Your game may not have been updated, that's why your version is fine, but after reinstall it will download "broken" file. Activision after a month changed execuable version to official 1.8, but it still breaks everything, because you can't enter any 1.7/x1.8 server. Retail versions are still 1.7. Also it resets stats from old profile folder, which 1.7 uses (not a big deal since x1.8 saves it in %localappdata%). Some screenshots from Steam Version (yes, I broke cod :D):
About risk: Activision patched all CoD series, where this vulnerability occured. The exploit we are talking is called RCE (Remote Code Execution). This particular RCE was dangerous for host. Host has to receive the data of every other player. The hacker could easily send malicious packets to host PC by overflowing some buffers, so you could easily send any malware you wanted to. In cod4 this problem hardly ever existed, because you would have to run a listen server and a hacker would need to have rcon to do any damage. However in cod4 exist another RCE, which is also dangerous. Look how codx18 automatically installs on your pc without any permission. Hopefully x1.8 patch all known vulnerabilities. However I know another leaks in modern cods, which are still not patched. If you want more details I added threads about it. You can also search google for it.