Umbrella Virtual ApplianceApplication · Cisco
CVE-2026-20246
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability in the vmadmin CLI of Cisco Umbrella Virtual Appliance could allow an authenticated, local attacker to elevate privileges on an affected device. This vulnerability is due to insufficient validation of user-supplied commands. An attacker with vmadmin privileges could exploit this vulnerability by using certain commands at the CLI. A successful exploit could allow the attacker to elevate privileges to root.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe vulnerability exists in the vmadmin CLI of Cisco Umbrella Virtual Appliance. An authenticated attacker with vmadmin-level local access can execute specially crafted commands that bypass normal permission checks due to insufficient input validation, allowing privilege escalation to root.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Umbrella Virtual ApplianceApplication
< 3.8.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Cisco Umbrella Virtual Appliance versionAccess the appliance CLI or management interface and retrieve the installed version using the appropriate version display commandAffected if The installed version is prior to 3.8.5
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Confirm vmadmin local account existsCheck if the vmadmin account is enabled on the appliance by reviewing local user configurationAffected if The vmadmin account is present and accessible on the system
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Review vmadmin CLI session logsExamine appliance logs for vmadmin CLI activity, focusing on command execution patterns and privilege escalation attemptsAffected if There are logs of unusual commands or privilege escalation attempts originating from vmadmin sessions
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Audit system for unauthorized root accessReview system authentication and command logs for any root-level operations performed by or attributed to the vmadmin userAffected if Evidence exists of vmadmin successfully executing commands at root privilege level
The environment is affected if Cisco Umbrella Virtual Appliance is running a version below 3.8.5 and the vmadmin account is accessible, as this combination allows the privilege escalation vulnerability to be exploited.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped3.8.5
Apply the vendor patch from Cisco when available. Until then, limit vmadmin account access to trusted administrators only and monitor for suspicious CLI usage patterns.
3.8.5 or later
- 1. Back up the current configuration of the Cisco Umbrella Virtual Appliance.
- 2. Download Cisco Umbrella Virtual Appliance version 3.8.5 or later from the Cisco download portal.
- 3. Upgrade the Virtual Appliance to version 3.8.5 or later using the standard upgrade procedure.
- 4. Verify the upgrade was successful by logging into the vmadmin CLI and confirming the version.
- 5. Verify that the vmadmin user can no longer escalate to root privileges using the previously vulnerable commands.
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Umbrella Virtual Appliance
Scoped from the published advisory
- Consultation4.0 h
- Implementation2.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,928.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20246 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-20246 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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