Executive Summary

CVE-2026-20246 is a privilege escalation vulnerability in the Cisco Umbrella Virtual Appliance. It occurs due to insufficient validation of user-supplied commands in the vmadmin CLI.

An authenticated, local attacker who already has vmadmin privileges could exploit this vulnerability by using certain commands at the CLI to elevate their privileges to root.

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Impact Analysis

This vulnerability allows an attacker with vmadmin privileges to escalate their access to root level on the affected device.

With root privileges, the attacker could gain full control over the Cisco Umbrella Virtual Appliance, potentially compromising the security and integrity of the system.

There are no known workarounds, so the only mitigation is to upgrade to Cisco Umbrella Virtual Appliance version 3.8.5 or later, which contains the fix.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade your Cisco Umbrella Virtual Appliance to version 3.8.5 or later, which contains the fix for this privilege escalation issue.

There are no available workarounds for this vulnerability, so applying the software update is the only effective mitigation.

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Detection Guidance

There are no specific detection methods or commands provided to identify this vulnerability on your network or system.

The vulnerability involves insufficient validation of user-supplied commands in the vmadmin CLI of Cisco Umbrella Virtual Appliance, exploitable only by an authenticated local attacker with vmadmin privileges.

Cisco has released software updates to address this issue, and customers are advised to upgrade to version 3.8.5 or later to remediate the vulnerability.

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