What’s Vulnerable › Vulnerabilities
CVE-2017-6679
- Severity: medium (CVSS 6.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2017-12-01 · updated 2026-06-22
Description
The Cisco Umbrella Virtual Appliance Version 2.0.3 and prior contained an undocumented encrypted remote support tunnel (SSH) which auto initiated from the customer's appliance to Cisco's SSH Hubs in the Umbrella datacenters. These tunnels were primarily leveraged for remote support and allowed for authorized/authenticated personnel from the Cisco Umbrella team to access the appliance remotely and obtain full control without explicit customer approval. To address this vulnerability, the Umbrella Virtual Appliance version 2.1.0 now requires explicit customer approval before an SSH tunnel from the VA to the Cisco terminating server can be established.
Affected products
- Cisco Umbrella Insights Virtual Appliance: before 2.1.0 — fixed in 2.1.0
How to fix
Upgrade to a fixed version: Cisco Umbrella Insights Virtual Appliance 2.1.0. Check the vendor advisory for mitigations.
References
- http://www.securityfocus.com/bid/101567
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-tunnel-gJw5thgE
- https://support.umbrella.com/hc/en-us/articles/115004154423
- https://support.umbrella.com/hc/en-us/articles/115004752143-Virtual-Appliance-Vulnerability-due-to-always-on-SSH-Tunnel-RESOLVED-2017-09-15
- https://www.info-sec.ca/advisories/Cisco-Umbrella.html
- http://www.securityfocus.com/bid/101567
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-tunnel-gJw5thgE
- https://support.umbrella.com/hc/en-us/articles/115004154423
- https://support.umbrella.com/hc/en-us/articles/115004752143-Virtual-Appliance-Vulnerability-due-to-always-on-SSH-Tunnel-RESOLVED-2017-09-15
- https://www.info-sec.ca/advisories/Cisco-Umbrella.html
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