Cisco Umbrella Virtual Appliance Static SSH Host Key Vulnerability

published 2022-04-21 4 y ago modified 2026-06-22 4 mo ago also EUVD-2022-26023

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

cisco umbrella_virtual_appliance 3.3.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-11-06)

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Cisco Cisco Umbrella Insights Virtual Appliance

Classification

Weakness

CWE-321 Use of Hard-coded Cryptographic Key
CWE-798 Use of Hard-coded Credentials

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-uva-static-key-6RQTRs4c
vendor-advisory

Sources

CVE List CVE-2022-20773
NVD CVE-2022-20773

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.

Summary