- Native Minecraft Version:
- Legacy (< 1.13)
- Tested Minecraft Versions:
- Source Code:
- GladUrBad (Main Dev), frep (Contributor) , Tecnio (Contributor), Elevated (Contributor), retrooper (PacketEvents Dev), Sms_Gamer (Contributor), funkemunky (Contributor)
Medusa is a simple, free, open-source anti-cheat solution for 1.7-1.12.2 servers (1.9+ support still experimental). Because of this anti-cheat being open sourced, you can modify Medusa to fit your needs better.
(Compatible but experimental)
Medusa uses PacketEvents by retrooper.
Check it out here.
Medusa is licensed under the GPLv3 License.
Basic support is offered for Medusa Anticheat here.
- AimAssist (7 checks)
- Autoclicker (4 checks)
- Killaura (5 checks)
- Hitboxes/Reach (3 checks)
- Velocity (2 checks)
- Fly/NoFall (6 checks)
- Jesus (2 checks)
- Motion (4 checks)
- Speed (3 checks)
- FastClimb (1 check)
- Protocol (10 checks)
- Hand/Interaction (3 checks)
- Scaffold (1 check)
- Timer (3 checks)
- medusa.alerts - Allows you to see alerts when players cheat.
- medusa.logs - Allows you to see session logs for the player.
- medusa.commands - Allows you to run commands.
Simply download the Medusa.jar file by clicking the download button on this page, and drag it into your server "plugins" folder, then start your server.
- Medusa may not work properly if you reload the plugin.
Medusa AntiCheat Lite v1.5.7
Free | Open Source | Effective | Quick Detection | 1.7-1.12.2
The reach check is probably the best you'll find inside a free anti-cheat currently.
Here are some statistics I obtained about the reach check after conducting some tests against the StrikePractice "Hard" Bot using default Medusa settings:
False positives per 5000 legit hits (140-160ms): 0
False positives per 5000 legit hits (1000+-50ms): 2
False positives per 5000 legit hits (Clumsy Throttle: 125ms, 10% Chance): 5
Lowest detection (140-160ms): 3.5 Reach (3 Alerts)
Lowest detection (1000+-50ms): 3.4 Reach (1 Alert)
Lowest detection (Clumsy Throttle: 125ms, 10% Chance): 3.25 (3 Alerts)
The detections were tested by using correctly calculated reach at different values. The sample size was 50 reach hits. The lowest value I tested was 3.15.
Here's how Medusa's reach check compares detection wise against other anti-cheats that I've tested (140-160ms):
And here's how it compares against Verus (1000+-50ms):
It's important to note that Verus was not tested against the StrikePractice "Hard" bot but a real player.
I also have to mention that Medusa's movement checks produced quite a lot of false positives especially with higher latency.
Some aim checks also were producing false positives when teleporting so you'd definitely need to mess around with the config.
It false flags a lot but as long as you disable the right checks then you're good.
It supports most of the common hacks, I would love to see ping spoofing support as a normal human being cannot detect it.
I don't know how ping spoofing works but I know some anticheats can detect it so, it is possible.