CYREX
Unreal Engine Security & Hardening
Engine-Specific Security

Unreal Engine Security & Hardening

High-fidelity multiplayer requires high-fidelity security. Unreal Engine is industry-leading, but it is not secure by default. We bridge the gap between engine capabilities and runtime protection.

Book Unreal Security Assessment

Cyrex Protoceptor Tooling

Pair Hacking Methodology

UE4 & UE5 Expertise

Why Unreal Engine Security Matters

Unreal Engine provides a robust networking framework, but security depends entirely on how it is implemented. The engine gives you the canvas - the security of the game-state is yours to build.

Unreal Provides Tools
ENGINE-AWARE TESTING

Unreal Provides Tools

Security requires validation

Trusting Client Input: The #1 failure in Unreal development. We test whether your server blindly accepts client-provided variables (e.g., health, position, ammo) without authoritative validation.

Improper RPC Validation: Remote Procedure Calls are the main communication channel in UE. We identify where attackers can inject, mutate, or replay RPCs to trigger unauthorized server-side functions.

Over-reliance on Client-Side Authority: Unreal allows for flexible ownership models, but relying on the client to calculate game-critical outcomes (like damage or inventory changes) is a catastrophic design flaw.

Inconsistent Replication Rules: We stress-test your replication graph to ensure that "invisible" or "fog-of-war" data isn't being sent to unauthorized clients (a common cause of wallhacks and map-hacks).

Poor Role Enforcement: Using NetRoles (ROLE_Authority vs. ROLE_AutonomousProxy) requires strict discipline. We audit your access control to ensure that only the server has the authority to change game state.

When exploited, these flaws can:

Enable cheating
Manipulate economies
Break competitive balance
Expose player data

What We Test in Unreal Engine Games

We don't treat Unreal as a black box. We audit the specific networking primitives, replication graphs, and server-side logic that define your game’s security posture.

Cyrex Protoceptor™

Standard pentesting tools often fail to decode the complex, serialized network protocols used in modern AAA multiplayer titles. We developed Cyrex Protoceptor™ - our proprietary engine-introspection tool - to achieve deep, granular visibility into Unreal Engine network traffic.

Deep Unreal Protocol Analysis: We bypass the "black box" of Unreal networking to analyze proprietary game communication out-of-the-box.
Packet-Level RPC Inspection: We capture, decode, and analyze Remote Procedure Calls at the packet level, allowing us to identify mutable parameters before the server processes them.
Trust Boundary Benchmarking: We map the exact flow of data between the client and server to identify where the "Server-Side Authority" check occurs—and where it is missing.
Authoritative State Validation: Our tool logs state changes, allowing us to pinpoint exactly when a client successfully tricks the server into accepting an illegal state (e.g., impossible movement or inventory changes).
Tamper-Point Identification: We identify specific serialization fields and RPC headers that are vulnerable to injection, enabling precise exploit simulation.

Unreal is Our Specialty. Multiplayer Security is Our Standard.

Our Methodology

Pair Hacking for Unreal Architecture

Multiplayer games are complex, high-frequency ecosystems. Exploits thrive in the latency and logic gaps between the client and the server. All Cyrex engagements utilize Pair Hacking - the synergy of our senior offensive engineers and AI-augmented offensive toolsets. We work in real-time to bridge the divide between binary analysis and server-side validation, ensuring engine-specific security is never left to chance.

Client + Server Chaining

We don’t test in silos. One engineer probes the game binary for memory injection while the second simultaneously pressures the backend APIs. We chain these findings to prove how a "minor" client exploit can lead to a "critical" server-side economy compromise.

Coordinated Cheating

Real-world exploits often require coordination (e.g., Player A blocking the server while Player B duplicates an item). We replicate these multi-player exploitation scenarios in parallel, testing your server’s logic under heavy, coordinated load.

Desync Validation

We systematically test desynchronization scenarios - identifying the exact milliseconds where the client’s "truth" conflicts with the server’s "authority," enabling speed-hacks and teleportation exploits.

Logic Flaw Discovery

Single-tester engagements usually stop at the first roadblock. Our Pair Hacking approach ensures that if a path looks blocked, we collaborate to find the "side-door." This is how we uncover the complex, multi-stage attack chains that define modern gaming breaches.

Tailored Testing for Your Development Lifecycle

When to Schedule Unreal Engine Security Testing

Pre-Launch Certification: The final "Go/No-Go" gate. Validate your network replication, RPC handling, and server-authoritative logic before the public gains access to your binary.
Before Early Access: This is your first major exposure point. Early Access players are highly motivated to reverse-engineer your client. Harden the system before the community begins probing your binaries.
Before Esports Events: When prize pools and tournament reputation are at stake, the motivation for cheating is at its peak. We validate competitive integrity to prevent "integrity scandals" that can cripple your game's esports scene.
Major Multiplayer Updates: Every major content drop or expansion introduces new actors and mechanics. Regression testing for these updates is essential to ensure new features haven't introduced "backdoor" exploits.
Economy System Changes: When you adjust loot tables, trading logic, or currency issuance, you are modifying the "vault." Audit these changes specifically to prevent duplication and inflation exploits.
After Cheat Detection Spikes: If telemetry reports a surge in suspicious behavior, we perform a "Post-Mortem" audit. We analyze the new exploit vectors to identify the logic gaps that allowed these specific cheats to proliferate.
Prior to Console Submission: Platform holders (Sony, Microsoft, Nintendo) have stringent Technical Requirements (TRCs/XRs) regarding security and binary integrity. We audit your build to ensure it passes the platform holder's security compliance requirements.

If your game relies on multiplayer synchronization, structured security testing is mandatory. Do not wait for a community-driven exploit to define your game’s security posture.

What Our Clients Say

Real experiences from teams we've protected

Cyrex earned our trust through deep domain knowledge and high-quality deliverables. They are the experts for securing complex software and platforms.

Immutable

A true partnership mentality. Their experts bring deep technical expertise and a structured, methodical approach to securing our infrastructure.

Amazon Games

Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.

AccelByte

Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.

Sumo Digital

Professional and enjoyable. Their team delivered detailed, thorough results with minimal effort required on our part.

Stunlock Studios

Invaluable for our blockchain products. Their thorough investigations ensure a safer environment for our users and players.

Project Seed

Cyrex earned our trust through deep domain knowledge and high-quality deliverables. They are the experts for securing complex software and platforms.

Immutable

A true partnership mentality. Their experts bring deep technical expertise and a structured, methodical approach to securing our infrastructure.

Amazon Games

Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.

AccelByte

Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.

Sumo Digital

Professional and enjoyable. Their team delivered detailed, thorough results with minimal effort required on our part.

Stunlock Studios

Invaluable for our blockchain products. Their thorough investigations ensure a safer environment for our users and players.

Project Seed

Cyrex earned our trust through deep domain knowledge and high-quality deliverables. They are the experts for securing complex software and platforms.

Immutable

A true partnership mentality. Their experts bring deep technical expertise and a structured, methodical approach to securing our infrastructure.

Amazon Games

Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.

AccelByte

Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.

Sumo Digital

Professional and enjoyable. Their team delivered detailed, thorough results with minimal effort required on our part.

Stunlock Studios

Invaluable for our blockchain products. Their thorough investigations ensure a safer environment for our users and players.

Project Seed

Security Must Be
Engineered, Not Assumed

Unreal Engine enables powerful multiplayer systems. But power without security creates risk.

Engage Cyrex for structured Unreal Engine security testing built for real-world multiplayer environments. We test replication logic, authority enforcement, and real gameplay abuse scenarios.

Schedule Unreal Security Assessment
View Case Studies
Cyrex Protoceptor™
Pair Hacking Methodology
UE4 & UE5 Expertise