CVE-2025-0618 is a vulnerability classified under CWE-94, indicating improper control of code generation, commonly known as a code injection flaw, found in Trellix FireEye Endpoint Detection and Response (EDR) HX version 10.0.0. The vulnerability arises when a malicious actor sends a specially crafted tamper protection event to the HX service, which triggers an exception. This exception causes the tamper protection mechanism to fail persistently, preventing any further tamper protection events from being processed. Notably, this failure persists even after the affected system is rebooted, effectively disabling a critical security control designed to protect the EDR agent from tampering. The tamper protection feature is essential for maintaining the integrity and reliability of the EDR agent, as it prevents unauthorized modifications or disabling of the agent by attackers. The vulnerability does not appear to require authentication or user interaction, meaning an attacker with network access to the HX service could exploit it remotely. Although no known exploits are currently reported in the wild, the nature of the vulnerability allows for a persistent denial of service (DoS) against the tamper protection functionality, which could facilitate further attacks by weakening endpoint defenses. The lack of a patch link suggests that remediation may not yet be publicly available, increasing the urgency for affected organizations to monitor vendor communications and apply updates promptly once released.

For European organizations, the impact of this vulnerability could be significant, particularly for those relying on Trellix FireEye EDR HX 10.0.0 for endpoint security. By disabling tamper protection, attackers could more easily disable or manipulate the EDR agent, potentially allowing malware or advanced persistent threats (APTs) to evade detection and maintain persistence on critical systems. This increases the risk of data breaches, intellectual property theft, and disruption of business operations. The persistent nature of the DoS means that even system reboots will not restore tamper protection, prolonging the window of vulnerability. Organizations in sectors with high regulatory requirements, such as finance, healthcare, and critical infrastructure, may face compliance risks and reputational damage if exploited. Furthermore, the ability to remotely trigger this vulnerability without authentication broadens the attack surface, making it a viable vector for attackers targeting European enterprises with sophisticated cyber espionage or ransomware campaigns.

Given the absence of an official patch at this time, European organizations should implement several specific mitigation strategies: 1) Network segmentation and strict access controls should be enforced to limit which systems and users can communicate with the FireEye EDR HX service, reducing exposure to unauthorized tamper protection events. 2) Deploy network intrusion detection systems (NIDS) or endpoint monitoring solutions capable of detecting anomalous or malformed tamper protection events to identify potential exploitation attempts early. 3) Regularly audit and monitor the status of tamper protection on endpoints to detect if the protection has been disabled or is not processing events as expected. 4) Implement strict logging and alerting on the HX service to capture exceptions or failures related to tamper protection processing. 5) Maintain up-to-date backups and incident response plans that include scenarios involving EDR tampering or disabling. 6) Engage with Trellix support and subscribe to security advisories to receive timely updates and patches. 7) Consider deploying additional endpoint security layers that do not rely solely on tamper protection mechanisms vulnerable to this flaw, thereby providing defense in depth.