Important thing in a dedicated server: SPOT THE CHEATERS

Counter-Strike has been a big target for exploitation by cheaters since its release. In-game, cheating is often referred to as "hacking" in reference to programs or "hacks" executed by the client.

    Wallhacks allows players to see through walls. These work by displaying objects that are normally obscured or by replacing opaque game textures with translucent ones. As the engine renders only the immediate area around the player, this does not allow a player to see the entire level at once.
    Speedhacks give the player increased foot speed. These work by sending false synchronization data to the server.
    No recoil removes any recoil (and thus improves accuracy) from a player's weapon.
    No spread is used to remove the random deviation normally experienced when the player shoots. This is similar to the recoil hack.
    Aimbots auto-target other players. Some include auto-shot. These work by using the game client library to calculate an enemy player's 2D coordinates from 3D space and automatically moving the player's mouse to the enemy target. It also consists of headshot aiming where a player shoots a bullet at the enemy which directly hits the enemy's head.
    Silent Aimbots works with the way networking works in id Tech. Viewangles are sent to the server via packets, and totally out-of-sync with frames. Typically, multiple packets will be sent every frame. Therefore, a hacker can manipulate the system and have different angles sent to the server than the angles that are displayed on screen each frame, making it appear as if your view isn't moving with the aimbot.
    ESP shows textual information about the enemy; such as health, name and distance; also information about weapons lying around the map, which could be missed without the hack. Most ESP cheats show info through walls.
    Barrel hack depicts an enemy's gaze as a visible line, this is also visible in the killcam.
    Anti-flash and anti-smoke remove the effects of the flashbang and smoke grenade. Implementation is derived from the wall hack.
    Unlimited HP and ammo are not hacks, but are server-side modifications.
    Bunnyhop script a script that causes the player to jump exactly when they hit the ground, this can be exploited along with strafing to gain an unreasonable amount of speed (bunnyhopping can commonly be mistaken as speed hacking). This can be done legitimately as well, but is not nearly as effective. Players can navigate a map in a fraction of what it would take normally via bunnyhopping.
    No-clip allows players to move through the map without regard to traditional wall boundaries. This means players are like ghosts that can move through obstacles.