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Exploited vulnerability · CISA KEV

Is CVE-2021-36741 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2021-36741, Trend Micro Multiple Products Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 97 days after it was published. It affects Trend Micro Apex One, Apex One as a Service, 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
EPSStop 10%more likely than most to be exploited
severity8.8CVSS 3.1 · high
US federal due17 Nov 2021BOD 22-01 deadline

What it is

Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows a remote attacker to upload files.

VendorTrend Micro (12 exploited CVEs in KEV)
ProductApex One, Apex One as a Service, and Worry-Free Business Security
VulnerabilityTrend Micro Multiple Products Improper Input Validation Vulnerability
WeaknessCWE-22
Published29 Jul 2021
Added to KEV3 Nov 2021
Reported by (CNA)trendmicro

What to do

  1. Check whether you run it. Look for Apex One, Apex One as a Service, 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 29 Jul 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Trend Micro.

Other exploited CVEs in Apex One, Apex One as a Service, and Worry-Free Business Security

References

Questions

Is CVE-2021-36741 being exploited?

Yes. CISA added CVE-2021-36741 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-36741 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-2021-36741?

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, Apex One as a Service, 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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