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CVE-2026-20246 Cisco CVE debrief

CVE-2026-20246 is a medium-severity vulnerability in the vmadmin CLI of Cisco Umbrella Virtual Appliance. An authenticated, local attacker could exploit insufficient validation of user-supplied commands to elevate privileges to root. This vulnerability exists due to inadequate command validation in the vmadmin CLI, allowing an attacker with vmadmin privileges to use certain commands and potentially gain elevated privileges. System administrators and security teams should prioritize patching this vulnerability to prevent potential privilege escalation attacks.

Vendor
Cisco
Product
Cisco Umbrella Insights Virtual Appliance
CVSS
MEDIUM 6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-22
Advisory published
2026-06-17
Advisory updated
2026-06-22

Who should care

System administrators and security teams responsible for Cisco Umbrella Virtual Appliance should prioritize patching this vulnerability to prevent potential privilege escalation attacks. Additionally, operators and platform administrators should be aware of the vulnerability and its potential impact on the system.

Technical summary

The vulnerability exists in the vmadmin CLI of Cisco Umbrella Virtual Appliance due to insufficient validation of user-supplied commands. An attacker with vmadmin privileges could exploit this by using certain commands at the CLI, potentially allowing them to elevate privileges to root. The vulnerability is caused by inadequate input validation and sanitization of user-supplied commands in the vmadmin CLI. This allows an attacker to execute commands with elevated privileges, potentially leading to unauthorized access and control of the affected system.

Defensive priority

Medium priority should be given to patching this vulnerability, as it could allow an authenticated local attacker to gain elevated privileges.

Recommended defensive actions

  • Apply the patch provided by Cisco as soon as possible.
  • Review and restrict vmadmin CLI access to only necessary personnel.
  • Monitor system logs for suspicious activity related to the vmadmin CLI.
  • Consider implementing additional security measures such as multi-factor authentication for vmadmin access.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-06-17T17:16:43.423Z and was last modified on 2026-06-22T13:24:17.140Z. The NVD entry is currently Analyzed. Evidence from the CVE record and NVD entry indicates that this vulnerability affects Cisco Umbrella Virtual Appliance. However, detailed information about the affected versions or configurations is limited. Defenders should verify the affected scope and vendor guidance for accurate risk assessment.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20246 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20246

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-20246 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20246

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.