Cisco ThousandEyes Virtual Appliance DHCP Client Command Injection Remote Code Execution Vulnerability

September 22nd, 2026
ZDI-26-719 ZDI-CAN-31647

CVE ID

CVE-2026-20350

CVSS Score

7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Cisco

Affected Products

ThousandEyes

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco ThousandEyes Virtual Appliance. Authentication is required to exploit this vulnerability.

The specific flaw exists within the processing of DHCP client configuration data. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-teva-os-command-W4GAO6jp

Disclosure Timeline

  • 2026-06-04 - Vulnerability reported to vendor
  • 2026-09-22 - Coordinated public release of advisory
  • 2026-09-22 - Advisory Updated

Credit

Andy Niu of TrendAI Research

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