CVE-2017-6679

6.4 MEDIUM 0.3% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine with an admin-level account. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2017-12-01 17:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-22 13:52 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 6.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2017-12-01 17:29 UTC
Last modified: 2026-06-22 13:52 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Record status: Analyzed

Affected

Cisco Umbrella Virtual Appliance < 2.1.0

Attack profile CVSS 3.1 · 6.4

Attack vector: Local
Complexity: High
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record