FiveM is crashing because its security system is detecting something suspicious or leftover from past cheats or mods on my system.

[Pinguuuzin]

What is the issue you’re having?

I’m getting a crash in FiveM with the error legitimacy.dll!SecurityPatternLoadHints (0x4387c). From what I understand, this is related to FiveM’s anti-cheat and security system. It seems like FiveM is detecting something in my system that it considers unsafe or suspicious. I used cheats in CS:GO in the past, and I also had mods installed in GTA V, but I’ve already removed all of them. I’ve also tried everything: restarting my PC, running FiveM as administrator, clearing the cache, verifying GTA V files, reinstalling both GTA V and FiveM, updating drivers and Windows — and the issue still happens. I think maybe there are leftover files or drivers that FiveM still detects, even though I’ve cleaned everything I could.

What have you tried already to fix the issue?

1. Restarted the PC and FiveM
2. I’ve already restarted my computer and the FiveM client.
3. Closed All Conflicting Programs
4. No third-party apps like cheat tools, overlays, debuggers, or injectors are running.
5. Ran FiveM as AdministratorI’ve tried launching FiveM with administrator privileges.
6. Verified and Reinstalled GTA V
7. I verified the integrity of GTA V files, and even uninstalled and reinstalled the game.
8. Cleared FiveM Cache
9. I deleted the cache folder inside the FiveM Application Data.
10. Reinstalled FiveM
11. I fully uninstalled and then reinstalled the latest version of FiveM.
12. Updated Windows and GPU Drivers
13. My system and graphics drivers are fully up to date.

What server did you get this issue on?

Nothing

Error screenshot(s)

Windows version

Windows 10 Pro

System specifications

Nome do Dispositivo PINGUIM
Processador Intel(R) Core™ i5-4460S CPU @ 2.90GHz 2.90 GHz
RAM instalada 16,0 GB
Armazenamento 224 GB SSD ATA EMTEC X150 240GB
Placa Gráfica Radeon RX 560 Series (4 GB), Intel(R) HD Graphics 4600 (113 MB)
ID do Dispositivo 8FBB0961-B9B1-4C10-8AD1-E12C057247C0
ID do Produto 00330-50000-00000-AAOEM
Tipo de sistema Sistema operativo de 64 bits, processador baseado em x64
Caneta e toque Não está disponível introdução por caneta ou toque para este ecrã

Antivirus software

Windows Antivirus

CitizenFX crash zip file (‘Save information’ on a crash)

CfxCrashDump_2025_08_08_17_42_43.zip (248 KB)

[system]

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