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Exploited vulnerability · CISA KEV

Is CVE-2020-3161 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Cisco IP Phones · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-3161, Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 567 days after it was published. It affects Cisco IP Phones. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.0 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Cisco IP Phones contain an improper input validation vulnerability for HTTP requests. Exploitation could allow an attacker to execute code remotely with root privileges or cause a denial-of-service (DoS) condition.

VendorCisco (103 exploited CVEs in KEV)
ProductCisco IP Phones
VulnerabilityCisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability
WeaknessCWE-20
Published15 Apr 2020
Added to KEV3 Nov 2021
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for Cisco IP Phones in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco 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 15 Apr 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

Questions

Is CVE-2020-3161 being exploited?

Yes. CISA added CVE-2020-3161 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-3161 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-2020-3161?

Apply updates per vendor instructions. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Cisco IP Phones 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 · Cisco scorecard · act-now radar.

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