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PatchSiren cyber security CVE debrief

CVE-2020-8599 Trend Micro CVE debrief

CVE-2020-8599 affects Trend Micro Apex One and OfficeScan and is listed by CISA as a Known Exploited Vulnerability. Organizations running these products should treat remediation as urgent and follow vendor update guidance.

Vendor
Trend Micro
Product
Apex One and OfficeScan
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security and IT teams responsible for Trend Micro Apex One or OfficeScan deployments, especially administrators who manage updates, endpoint protection, and related incident response.

Technical summary

The available source material identifies CVE-2020-8599 as an authentication bypass vulnerability in Trend Micro Apex One and OfficeScan. CISA included it in the Known Exploited Vulnerabilities catalog, which indicates it is considered a vulnerability of active defensive significance. No additional technical details or CVSS score were provided in the supplied corpus.

Defensive priority

High. Because this CVE is in CISA’s KEV catalog, affected environments should prioritize remediation using vendor instructions and verify that updates have been applied.

Recommended defensive actions

  • Apply updates per the vendor’s instructions.
  • Inventory all Apex One and OfficeScan installations to confirm exposure.
  • Verify remediation status across managed endpoints and servers.
  • Review CISA KEV guidance and vendor advisories for any additional required actions.
  • Investigate for unauthorized access if the affected products were unpatched during the exposure window.

Evidence notes

The source corpus identifies the vulnerability name, affected Trend Micro products, and CISA KEV status. The supplied data does not include a CVSS score, exploit mechanism details, or confirmed campaign attribution. Timeline context from the corpus shows CVE published/modified on 2021-11-03 and CISA KEV dateAdded on 2021-11-03 with dueDate 2022-05-03.

Sources and references

Verified primary and authoritative sources

  • CVE-2020-8599 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2020-8599

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2020-8599 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2020-8599

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.