You can find "undetected" DLL injectors on sketchy Russian forums right now. The code is small, the concept is simple, and because the game is 19 years old, no one is patching it. As a technical curiosity, the CoD2 wallhack is a fascinating artifact of early 2000s game security. It shows exactly why modern games stream geometry data to the server first.
Nothing ruins the immersion of fighting in the trenches of WWII like getting headshot through a stone wall by a player named xX_SniperElite_Xx who has a 12.0 K/D ratio. Do you have memories of playing Call of Duty 2 on PC? Did you ever use a wallhack in a private lobby just to see how it worked? Let us know in the comments (but be honest!). Call Of Duty 2 Wallhack
Because the engine relied on the client (your PC) to decide what to draw on screen, a hacker could simply intercept the DirectX calls. Essentially, they told the GPU: "Draw the player model, but do not apply the 'wall' depth test." The golden age of the CoD2 wallhack wasn't subtle. The most infamous version made enemies glow bright neon orange through every surface. You can find "undetected" DLL injectors on sketchy
But as a player experience? It killed the game. It shows exactly why modern games stream geometry