CVE-2022-40139

What is Trend Micro Apex One?

Trend Micro Apex One is Trend Micro's enterprise endpoint protection platform. In addition to real-time protection and policy management, Apex One includes version management features such as a rollback mechanism that allows administrators to revert the server's security components to a previous version. This mechanism — designed for recovery from failed updates — processes component files and executes them in the context of the privileged server process. Improper validation of rollback component integrity creates a code injection vector for attackers with administrative access to the management console.

Overview

CVE-2022-40139 is an improper validation vulnerability in the rollback mechanism of Trend Micro Apex One and Apex One as a Service. An attacker with administrative access to the Apex One management console can specify crafted rollback components that are executed by the server without adequate integrity validation, achieving remote code execution on the server. CISA added CVE-2022-40139 to KEV on September 15, 2022 — four days before the CVE was formally published — indicating that CISA and Trend Micro coordinated the advisory around confirmed active exploitation, making this a zero-day at the time of disclosure.

Affected Versions

Technical Details

The Apex One rollback mechanism is designed to restore previous software component versions when an update fails or is undesirable. The rollback process downloads or reads rollback component files and executes them as part of the restoration workflow. A flaw in the integrity validation of these components allows an administrator-level attacker to supply crafted components — including executable payloads — that the server executes with its own elevated process privileges.

The PR:H (High Privileges Required) CVSS rating reflects that exploitation requires administrative credentials on the Apex One console. However, the zero-day KEV addition indicates threat actors had already obtained admin access (through credential theft, phishing of admin accounts, or lateral movement) and were using this vulnerability as a code execution mechanism on the management server — giving them persistent, privileged access to the security infrastructure and control over all managed endpoints.

Discovery

The vulnerability was identified based on active in-the-wild exploitation prior to public disclosure. CISA's pre-publication KEV addition confirms the vulnerability was discovered during threat intelligence or incident response rather than through proactive research.

Exploitation Context

CISA added CVE-2022-40139 to the KEV catalog on September 15, 2022 — before the CVE's formal NVD publication date of September 19, 2022. This ordering confirms active exploitation was observed prior to the public advisory, making it a zero-day. No specific threat actor group has been publicly attributed. The PR:H requirement means the most likely initial step is admin credential compromise; the rollback RCE then provides persistent code execution on the Apex One server.

Remediation

1. Apply the Critical Patch from Trend Micro advisory 000291528 immediately — for Apex One on-premise, this requires a server-side update; for Apex One as a Service, apply the advisory's agent patch.
2. Audit Apex One admin account activity — review login history and privilege grants for unexpected activity, particularly around September 2022.
3. Restrict Apex One console administrative access to dedicated management workstations on isolated networks.
4. Enable multi-factor authentication (MFA) for all Apex One admin console accounts to reduce risk from credential theft.
5. Review Apex One server event logs for unexpected rollback operations or component update events.

See Also

This CVE is part of a sustained pattern of Trend Micro Apex One management console vulnerabilities in CISA KEV spanning 2019–2026. See Attacking the Defenders: The Persistent Pattern of AV and EDR Products in CISA KEV for analysis of 18 KEV entries across Microsoft Defender, Trend Micro Apex One, McAfee, and Sophos.