CVE-2026-20028
Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
Severity
Medium 5
CVSS 3.1
Exploited
Not listed
EPSS
0.003
17.0th percentile
Discovered by
Third party
Vendor-published field
Published
Aug 5, 2026
Assigned by cisco
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.
Weakness: CWE-266
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Terminal Services Agent | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Terminal Services Agent