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Exploited vulnerability · CISA KEV

Is CVE-2019-3929 exploited? Yes: in CISA KEV since 15 Apr 2022

Gociux · Crestron Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-3929, Crestron Multiple Products Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 15 Apr 2022, 1081 days after it was published. It affects Crestron Multiple Products. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 15 Apr 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due6 May 2022BOD 22-01 deadline

What it is

Multiple Crestron products are vulnerable to command injection via the file_transfer.cgi HTTP endpoint. A remote, unauthenticated attacker can use this vulnerability to execute operating system commands as root.

VendorCrestron (1 exploited CVE in KEV)
ProductMultiple Products
VulnerabilityCrestron Multiple Products Command Injection Vulnerability
WeaknessCWE-79
Published30 Apr 2019
Added to KEV15 Apr 2022
Reported by (CNA)tenable

What to do

  1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Crestron 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 30 Apr 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Crestron.

References

Questions

Is CVE-2019-3929 being exploited?

Yes. CISA added CVE-2019-3929 to the Known Exploited Vulnerabilities catalog on 15 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-3929 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-2019-3929?

Apply updates per vendor instructions. Check Crestron's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Products 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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