Improper Neutralization of Special Elements in Output Used by a Downstream Component in Cisco ThousandEyes Virtual Appliance - CVE-2026-20199

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Main Vulnerability Database Vulnerabilities #VU132082

Improper Neutralization of Special Elements in Output Used by a Downstream Component in Cisco ThousandEyes Virtual Appliance - CVE-2026-20199

Published: May 21, 2026


Vulnerability identifier: #VU132082
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20199
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco ThousandEyes Virtual Appliance

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to insufficient validation of user-supplied input in the SSL certificate handling of Cisco ThousandEyes Virtual Appliance when uploading a certificate. A remote privileged user can upload a crafted certificate to execute arbitrary code.

Successful exploitation could result in code execution on the underlying operating system as the root user.


How to mitigate CVE-2026-20199

Install security update from vendor's website.

Sources