CVE-2020-8599
Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability
Published Mar 17, 2020 · corrected/updated Jun 16, 2026 · Trend Micro Apex One and OfficeScan · evidence confidence very high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2020-8599 is a critical public vulnerability record for Trend Micro Apex One and OfficeScan. CISA lists it as known exploited. Published remediation guidance: Apply updates per vendor instructions. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Trend Micro Apex One and OfficeScan is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: trendmicro/apex one (2019); trendmicro/officescan (xg); Trend Micro Apex One and OfficeScan. Published remediation guidance: Apply updates per vendor instructions. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 9.8, EPSS 11.9%. CISA lists it as known exploited. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Nov 3, 2021. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply updates per vendor instructions. CISA due date May 3, 2022.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 17, 2020 · Catalog
Detected
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.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
May 3, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
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.
Affected
- cpe trendmicro/apex one2019
- cpe trendmicro/officescanxg
- vendor Trend Micro Apex One and OfficeScanversion unspecified
Sources
- CISA KEVConfirmed exploitationCVE-2020-8599
Trend Micro Apex One and OfficeScan server contain a vulnerable EXE file that could allow a remote attacker to write data to a path on affected installations and bypass root login.
cisa.gov - CVE.orgVulnerability recordCVE-2020-8599
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2020-8599
30-day exploitation probability 11.9%
first.org - NIST NVDVulnerability recordCVE-2020-8599
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.
nvd.nist.gov - VulnCheck KEVConfirmed exploitationCVE-2020-8599
Trend Micro Apex One and OfficeScan server contain a vulnerable EXE file that could allow a remote attacker to write data to a path on affected installations and bypass root login.
vulncheck.com