CVE-2017-6679 json
The Cisco Umbrella Virtual Appliance Version 2.0.3 and prior contained an undocumented encrypted remote support tunnel (SSH) which auto ini…
published 2017-12-01 8 y ago modified 2026-06-22 4 mo ago also EUVD-2017-15733
- cvss
- 6.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- cisco umbrella_virtual_appliance 2.1.0
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.4 | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.0 | AV:L/AC:H/Au:S/C:C/I:C/A:C |
Affected products
- n/a Cisco Umbrella Virtual Appliance Version 2.0.3 and prior
References
-
sec.cloudapps.cisco.com
/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-tunnel-gJw5thgE
vendor-advisory
-
info-sec.ca
/advisories/Cisco-Umbrella.html
third-party-advisory
-
support.umbrella.com
/hc/en-us/articles/115004752143-Virtual-Appliance-Vulnerability-due-to-always-on-SSH-Tunnel-RESOLVED-2017-09-1
third-party-advisory
-
securityfocus.com
/bid/101567
vdb-entry, third-party-advisory
-
support.umbrella.com
/hc/en-us/articles/115004154423
third-party-advisory
Sources
- CVE List CVE-2017-6679
- NVD CVE-2017-6679
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.