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PatchSiren cyber security CVE debrief

CVE-2020-24557 Trend Micro CVE debrief

CVE-2020-24557 is a Trend Micro improper access control vulnerability affecting Apex One, OfficeScan, and Worry-Free Business Security. CISA has listed it in the Known Exploited Vulnerabilities catalog, which makes timely remediation a priority. The supplied source corpus does not include exploit details, affected version ranges, or impact specifics, so defenders should rely on the vendor’s update guidance and official advisories.

Vendor
Trend Micro
Product
Apex One, OfficeScan, and Worry-Free Business Security
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

Administrators and security teams responsible for Trend Micro Apex One, OfficeScan, or Worry-Free Business Security, especially organizations that track CISA KEV items and prioritize patching for security infrastructure.

Technical summary

The provided records identify CVE-2020-24557 as an improper access control issue in Trend Micro multiple products. The key defensive signal available in the corpus is CISA KEV inclusion, with the required action to apply updates per vendor instructions. No additional technical mechanism, exploitation path, or version scope is included in the supplied sources.

Defensive priority

Urgent. CISA KEV inclusion indicates active real-world exploitation, so remediation should be prioritized ahead of non-KEV items and tracked to completion.

Recommended defensive actions

  • Apply Trend Micro updates per vendor instructions as soon as possible.
  • Verify which environments run Apex One, OfficeScan, or Worry-Free Business Security.
  • Confirm remediation against the vendor’s official guidance and the CVE record.
  • Track the item to closure in vulnerability management because it is listed in CISA KEV.
  • Reassess exposure after patching and document the remediation date for audit purposes.

Evidence notes

Evidence is limited to the supplied CISA KEV source item metadata and official links. The corpus states: vendor Project Trend Micro; product Apex One, OfficeScan, and Worry-Free Business Security; vulnerability name "Trend Micro Multiple Products Improper Access Control Vulnerability"; date added 2021-11-03; due date 2022-05-03; required action "Apply updates per vendor instructions." The corpus does not provide exploit mechanics, affected versions, or CVSS values.

Official resources

CISA added CVE-2020-24557 to the Known Exploited Vulnerabilities catalog on 2021-11-03. The supplied corpus does not describe exploit mechanics or affected version ranges, so this debrief intentionally limits itself to the official metadata