CVE-2020-8599VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2020-8599: Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability

Affects Trend Micro Apex One and OfficeScanSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 11.9% chance of exploitation in 30 days – higher than 96% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2020-8599 (opens in a new tab)

Description

CVE-2020-8599 is a high-severity authentication bypass vulnerability in Trend Micro Apex One and OfficeScan server products. The vulnerability involves a vulnerable executable file that allows a remote attacker to write data to a path on affected installations and bypass root login. This flaw has been exploited in the wild. No specific affected versions or patch information is provided in the available data.

Summary

Trend Micro Apex One and OfficeScan servers contain a vulnerable executable file that enables a remote attacker to write data to a filesystem path on affected installations, resulting in the ability to bypass root login authentication. This vulnerability is identified as CVE-2020-8599 and has been exploited in the wild. The input data does not specify affected versions or patch availability.

Impact

Successful exploitation allows remote attackers to bypass root login authentication on affected Trend Micro Apex One and OfficeScan servers, potentially leading to unauthorized administrative access. This can compromise the security and integrity of the affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor Trend Micro advisories for updates and apply any official patches or mitigations once available.

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 08:43:21 UTC

References

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