Security readout for executives and security teams
Cisco IP phones can be taken over or forced to reboot through their built-in web server. The issue requires no login and can be triggered remotely if the phone web interface is reachable. Because CISA lists it in KEV, treat exposed devices as urgent. Exposure is most likely where Cisco IP phones have their web server enabled and reachable from untrusted networks. The provided bundle does not name exact affected models, firmware versions, or CPEs, so asset validation must use Cisco guidance. High priority. This is a critical, unauthenticated network issue affecting voice endpoints, with CISA KEV evidence of exploitation. Remediate or isolate exposed Cisco IP phones promptly, especially in environments where voice availability matters. Mitigation focus: Review Cisco advisory for affected models, fixed software, and vendor workarounds.; Prioritize remediation for reachable Cisco IP phone web interfaces.; Restrict phone web server access to trusted management networks only..
Michael Williams reviewed this cited source version on .
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ATT&CK lookup starting points
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Open ATT&CK lookupExecution behavior lookup
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Open ATT&CK lookupCVE-2020-3161 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200415 Cisco IP Phones Web Server Remote Code Execution and Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3161CVE reference · government-resource
Products and packages named in the record
CWE details
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Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.