NoClientExploits
by pro5383
NoClientExploits is a Fabric client mod that blocks several crash and exploit packets sent by malicious servers, and reports when it stops one.
What it does
Protection runs on the client only. When a connected server sends a packet built to crash or overload the game, such as teleports with infinite out-of-bounds coordinates, oversized explosion knockback, or billions of particles, the mod drops or neutralizes that packet before the render thread is affected. A player keeps playing while the attack is ignored.
The mod also covers the resource pack and identity side of a connection. It stops a remote server from pointing the client at localhost or private network addresses when it fetches a pack, and it can present a vanilla-style client brand so servers cannot fingerprint a modded client. Settings are reachable from a ModMenu config screen, where protections can be toggled, and chat alerts can be turned on to report each blocked attack.
Installation needs Fabric only, and the mod is released under the MIT License for Minecraft 1.21.4 – 1.21.11 (two release versions, with 1.0.0 for 1.21.11 as the latest file). It is not open source. Since only the client needs it, servers run without any change.
Key features
Malicious teleport blocking
Teleport packets with infinite or out-of-bounds coordinates, which can shatter the hitbox, are rejected on the client.
Explosion knockback limit
Explosion packets carrying oversized knockback, including those that use ExplodeBypass, are kept from launching the player.
Particle flood protection
Packets requesting billions of particles are stopped before they can lock up the render thread.
Local address block
Remote servers are prevented from directing resource pack fetches to localhost or the private network, which closes a LAN probe route.
Client brand spoofing
The client can report a vanilla brand, so servers cannot tell that a modded client is connecting.
Toggles and chat alerts
Each protection can be switched in the config menu, and optional chat messages report every attack that was blocked.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Anti Player Crasher is a client-side only Fabric mod under the MIT License, listed for 1.21.10, and it is not open source. Particle Crash Defender is also client-side only and MIT licensed, covering 1.20 – 26.1.2, with a narrower focus on particle floods. CrashFixer covers 1.21.8 – 26.3 under All rights reserved, and it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| NoClientExploits | Fabric | 1.21.4 – 1.21.11 | Client-side only | 2026-07-14 |
| Anti Player Crasher | Fabric | 1.21.10 | Client-side only | 2026-02-20 |
| Particle Crash Defender | Fabric | 1.20 – 26.1.2 | Client-side only | 2026-04-29 |
| CrashFixer | Fabric | 1.21.8 – 26.3 | Client-side only | 2026-09-22 |
Questions
Does NoClientExploits need to be installed on the server?
Which game versions does NoClientExploits support?
Can the protections be turned off?
In the catalog
NoClientExploits is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from pro5383
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What the author says
A lightweight, client-side Minecraft mod that shields you from malicious servers. Some servers send deliberately broken packets to freeze, crash, or fingerprint your game — NoClientExploits quietly blocks them before they ever reach you. 🧯
Official listing
- Modrinth page
- modrinth.com/mod/noclientexploits
- Owner
- pro5383
- Published
- 2026-07-14
- Updated on Modrinth
- 2026-07-14
- Facts verified
- 2026-10-15