Medium5.5Cisco

Medium [CVE-2026-20161] Cisco ThousandEyes Enterprise Agent Arbitrary File Overwrite Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20161 affecting ThousandEyes Enterprise Agent.

cisco-sa-te-agentfilewrite-tqUw3SMU Published Apr 15, 2026Updated by vendor Apr 15, 2026

CVE-2026-20161

Affected products & platforms

CiscoUnclassified

Open vendor advisory

Android app · Google Play

Monitor future Cisco CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

A vulnerability in the CLI of Cisco ThousandEyes Enterprise Agent could allow an authenticated, local attacker with low privileges to overwrite arbitrary files on the local system of an affected device.

This vulnerability is due to improper access controls on files that are on the local file system of an affected device. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system.

A successful exploit could allow the attacker to bypass file system permissions and overwrite arbitrary files on the affected device.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco ThousandEyes Enterprise Agent Linux Package installation type, regardless of device configuration.
Release 1.2 and earlier (first fixed: 1.234.0)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

1.234.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Release 1.2 and earlier: upgrade to 1.234.0.

Workaround status

There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.