Actively exploited in the wild
Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability
Trend Micro - Apex One and OfficeScan · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2020-8599
CriticalCVSS 9.8KEVSummary
Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.
Risk Assessment
An attacker can remotely write files to arbitrary locations and gain root privileges, leading to full system compromise.
Recommendation
Update Trend Micro Apex One and OfficeScan XG to the latest version containing the security fix.
Other vulnerabilities in Trend Micro Apex One
See all- CVE-2026-34926MediumActively exploited
A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents. The attack requires access to the server and prior administrative credentials.
- CVE-2025-71211Critical
A vulnerability in the Trend Micro Apex One management console (similar to CVE-2025-71210 but affecting a different executable) allows a remote attacker to upload malicious code and execute commands. Requires access to the management console. SaaS versions are already patched.
- CVE-2025-71210Critical
A vulnerability in the Trend Micro Apex One management console allows a remote attacker to upload malicious code and execute commands. Requires access to the management console. SaaS versions are already patched.
- CVE-2025-54948CriticalActively exploited
A vulnerability in Trend Micro Apex One (on-premise) management console could allow a pre-authenticated remote attacker to upload malicious code and execute commands on affected installations.
- CVE-2025-71216High
Time-of-check time-of-use vulnerability in Trend Micro Apex One (Mac) agent cache mechanism allows local attacker to escalate privileges. Requires prior low-privileged code execution. Patches available in ActiveUpdate/SaaS updates from mid/late 2025.
- CVE-2025-71214High
An origin validation error vulnerability in the Trend Micro Apex One (mac) agent iCore service could allow a local attacker to escalate privileges on affected installations. The attacker must first obtain the ability to execute low-privileged code on the target system.
- CVE-2025-71213High
An origin validation error vulnerability in Trend Micro Apex One could allow a local attacker to escalate privileges on affected installations. An attacker must first obtain the ability to execute low-privileged code on the target system.
- CVE-2025-71212High
Trend Micro Apex One has a link following vulnerability in the scan engine that could allow a local attacker to escalate privileges. The attacker must first have the ability to execute low-privileged code.
Original NVD description (English source)
Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.