cisco-sa-ts-agent-fw-bypass-MYBTMrevMediumCVSS 5.0

Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability

Published
August 5, 2026
Last Modified
August 5, 2026

🔗 CVE IDs covered (1)

CVE-2026-20028 →

📋 Description

A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.

This vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system.

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

CVE-2026-20028 — Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability (CVSS 3.1 5.0, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N)

🎯 Affected products8

  • Cisco Terminal Services Agent
  • Cisco Terminal Services Agent TSAgent-1.0
  • Cisco Terminal Services Agent TSAgent-1.1
  • Cisco Terminal Services Agent TSAgent-1.2
  • Cisco Terminal Services Agent TSAgent-1.3
  • Cisco Terminal Services Agent TSAgent-1.4
  • Cisco Terminal Services Agent TSAgent-1.4.1
  • Cisco Terminal Services Agent TSAgent-1.4.2

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (2)