CVE-2022-20773: Cisco Umbrella Virtual Appliance Static SSH Host Key Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-21 · updated 2026-06-22
Weakness: CWE-321

Description

A vulnerability in the key-based SSH authentication mechanism of Cisco Umbrella Virtual Appliance (VA) could allow an unauthenticated, remote attacker to impersonate a VA. This vulnerability is due to the presence of a static SSH host key. An attacker could exploit this vulnerability by performing a man-in-the-middle attack on an SSH connection to the Umbrella VA. A successful exploit could allow the attacker to learn the administrator credentials, change configurations, or reload the VA. Note: SSH is not enabled by default on the Umbrella VA.

Affected products

Cisco Umbrella Insights Virtual Appliance: before 3.3.2 — fixed in 3.3.2

How to fix

Upgrade to a fixed version: Cisco Umbrella Insights Virtual Appliance 3.3.2. Check the vendor advisory for mitigations.

References

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