FireEye EDR Vulnerability Allows Attackers to Execute Unauthorized Code

A critical vulnerability (CVE-2025-0618) in FireEye’s Endpoint Detection and Response (EDR) agent has been disclosed, enabling attackers to execute unauthorized code and trigger persistent denial-of-service (DoS) conditions.

The flaw, rated high severity, impacts tamper protection mechanisms in FireEye’s HX service and could disrupt critical security operations indefinitely.

Vulnerability Details

The issue stems from improper handling of tamper protection events by the FireEye EDR agent. Attackers can exploit this by sending a specially crafted event to the HX service, triggering an unhandled exception.

This exception not only halts further processing of tamper protection alerts but also persists across system reboots, effectively disabling a core defense feature.

• CVE ID: CVE-2025-0618 (CVSS score pending)
• Attack Vector: Remote code execution via malicious event injection.
• Impact:
  • Persistent DoS, rendering tamper protection non-functional.
  • Potential lateral movement by abusing the security gap.
• Discovery: Reported by Trellix’s Product Security Incident Response Team (PSIRT).

Affected Software and Mitigation

Trellix, FireEye’s parent company, has acknowledged the flaw and urges users to:

1. Monitor HX service logs for unusual tamper protection events.
2. Isolate vulnerable systems until patches are deployed.
3. Implement network segmentation to limit attack surface.

In an advisory, Trellix PSIRT confirmed the vulnerability and stated, “We are working closely with customers to mitigate risks.

Organizations should prioritize updating their EDR agents and review endpoint monitoring configurations.”

Cybersecurity analyst Priya Sharma of SafeNet Technologies warned, “This flaw undermines the very tools designed to stop advanced threats.

Attackers could exploit it to disable tamper protection silently, paving the way for ransomware or data exfiltration.”

1. Patch Promptly: Apply vendor-provided updates as they become available.
2. Monitor Endpoints: Use secondary detection tools to identify anomalous events.
3. Test Systems: Simulate attack scenarios to assess resilience.

CVE-2025-0618 highlights the paradox of security tools becoming attack vectors. With FireEye EDR widely used in enterprises, rapid action is critical.

Organizations must balance urgency with due diligence—verify patches, enforce layered defenses, and assume heightened vigilance until resolved.

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