CVE-2026-20028
Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
CVSS Score
5.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-266 |
| Vendor | cisco |
| Product | cisco terminal services agent |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
Cisco / Cisco Terminal Services Agent
TSAgent-1.3 TSAgent-1.4.2 TSAgent-1.2 TSAgent-1.4 TSAgent-1.0 TSAgent-1.4.1 TSAgent-1.1