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Exploited vulnerability · CISA KEV

Is CVE-2020-24557 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Trend Micro Apex One, OfficeScan, and Worry-Free Business Security · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-24557, Trend Micro Multiple Products Improper Access Control Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 428 days after it was published. It affects Trend Micro Apex One, OfficeScan, and Worry-Free Business Security. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity7.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Trend Micro Apex One, OfficeScan, and Worry-Free Business Security on Microsoft Windows contain an improper access control vulnerability that may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function, and attain privilege escalation.

VendorTrend Micro (12 exploited CVEs in KEV)
ProductApex One, OfficeScan, and Worry-Free Business Security
VulnerabilityTrend Micro Multiple Products Improper Access Control Vulnerability
Weaknessnot specified
Published1 Sep 2020
Added to KEV3 Nov 2021
Reported by (CNA)trendmicro

What to do

  1. Check whether you run it. Look for Apex One, OfficeScan, and Worry-Free Business Security in your asset inventory, including appliances and cloud images. Stack check lists every exploited Trend Micro CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 1 Sep 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Trend Micro.

References

Questions

Is CVE-2020-24557 being exploited?

Yes. CISA added CVE-2020-24557 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-24557 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-24557?

Apply updates per vendor instructions. Check Trend Micro's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Apex One, OfficeScan, and Worry-Free Business Security and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Trend Micro scorecard · act-now radar.

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