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Vulnerabilities

Vulnerability · CVE-2020-8599

Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability

Published Mar 17, 2020 · catalog updated Jun 16, 2026 · Trend Micro Apex One and OfficeScan

Patch now

CVE-2020-8599 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Trend Micro Apex One and OfficeScan against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
11.86%
Remediation
Remediation guidance
Affected products
cpe trendmicro/apex one · cpe trendmicro/officescan · vendor Trend Micro Apex One and OfficeScan

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe trendmicro/apex one2019
  • cpe trendmicro/officescanxg
  • vendor Trend Micro Apex One and OfficeScanversion unspecified

How to fix CVE-2020-8599

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-8599 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Trend Micro Apex One and OfficeScan against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with trendmicro/apex one 2019. Apply updates per vendor instructions.

What should an analyst verify?

No weakness class is stored. EPSS 11.86%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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.

  1. 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.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. 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.

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

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.