VAC3: Undetected (but use at your own risk )
Program version: 1.00
Game version: 1.2.358
Program needs a Net.Framework v 4.0
How to use:
1) Launch the game.
2) Launch this program.
3) Put your lvl (1-81) and prestige(0-10).
4) Press Hack.
5) Close this program.
6) Play some rounds (it'll save your stats).
Virusscans:
VirusTotal - Free Online Virus, Malware and URL Scanner
MW3LvlHack.rar - Jotti's malware scan