SB2026052148 - Privilege escalation in Cisco ThousandEyes Virtual Appliance

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2026-20199)

CWE-ID: CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tevacert-rce-RMJVEym5 
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwt77059