FireEye EDR Agent Vulnerability Let Attackers Inject Malicious Code

A significant vulnerability in the FireEye Endpoint Detection and Response (EDR) agent that could allow attackers to inject malicious code and render critical security protections ineffective.

The vulnerability, tracked as CVE-2025-0618, was disclosed today and highlights the ongoing challenges in securing endpoint protection platforms against sophisticated threat actors.

FireEye EDR Agent DoS Vulnerability

The newly identified vulnerability enables a malicious third party to invoke a persistent denial of service condition in the FireEye EDR agent by sending a specially crafted tamper protection event to the HX service, which triggers an exception in the processing logic. 

Security experts are particularly concerned because this exception prevents further tamper protection events from being processed, even after a system reboot, leaving endpoints vulnerable to additional attacks.

This vulnerability is especially dangerous because it directly targets the tamper protection mechanisms that are designed to prevent attackers from disabling security features. 

It essentially allows attackers to turn off the alarm system that would otherwise alert defenders to their presence. According to the vulnerability database, the affected product is identified explicitly as FireEye EDR HX version 10.0.0. 

Trellix, which now owns the FireEye product line, has acknowledged the issue and is working on a patch.

Risk Factors	Details
Affected Products	FireEye EDR HX version 10.0.0
Impact	Persistent denial of service; may lead to data loss via unprocessed events
Exploit Prerequisites	Attacker must send a specially-crafted tamper protection event to the HX service

Tamper protection is a critical security feature designed to prevent threat actors from disabling security measures that would detect their presence. 

When functioning correctly, tamper protection ensures that key security settings remain enabled, including real-time protection and threat detection capabilities.

By sending a specially crafted payload to the tamper protection event handler, attackers can cause an unhandled exception that crashes the event processing mechanism. 

The code to exploit this vulnerability requires detailed knowledge of the HX service architecture and tamper protection implementation specifics.

Additionally, the flaw is classified as a persistent denial of service vulnerability that primarily affects the security event processing capabilities. 

Security experts warn that while it directly causes a denial of service, it may indirectly lead to data loss through unprocessed events, leaving attackers’ activities undetected.

Organizations using the affected FireEye EDR agent are strongly advised to update to the latest version as soon as patches become available.

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