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Exploited vulnerability · CISA KEV

Is CVE-2016-4523 exploited? Yes: in CISA KEV since 15 Apr 2022

Gociux · Trihedral VTScada (formerly VTS) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-4523, Trihedral VTScada (formerly VTS) Denial-of-Service Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 15 Apr 2022, 2136 days after it was published. It affects Trihedral VTScada (formerly VTS). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 15 Apr 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.5CVSS 3.1 · high
US federal due6 May 2022BOD 22-01 deadline

What it is

The WAP interface in Trihedral VTScada (formerly VTS) allows remote attackers to cause a denial-of-service (DoS).

VendorTrihedral (1 exploited CVE in KEV)
ProductVTScada (formerly VTS)
VulnerabilityTrihedral VTScada (formerly VTS) Denial-of-Service Vulnerability
WeaknessCWE-119
Published9 Jun 2016
Added to KEV15 Apr 2022
Reported by (CNA)icscert

What to do

  1. Check whether you run it. Look for VTScada (formerly VTS) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Trihedral 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 9 Jun 2016.
  4. Get told next time. Email alerts when CISA adds a CVE for Trihedral.

References

Questions

Is CVE-2016-4523 being exploited?

Yes. CISA added CVE-2016-4523 to the Known Exploited Vulnerabilities catalog on 15 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-4523 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-2016-4523?

Apply updates per vendor instructions. Check Trihedral's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected VTScada (formerly VTS) 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 April 2022 · act-now radar.

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