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Vulnerabilities CVE-2026-20028

CVE-2026-20028

Medium
Open
TLP:CLEAR

Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability

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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.

Details

CVSS Score
5.0
EPSS Score
0.25%

16.9th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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