CVE-2026-20028
Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
Severity
Medium 5
CVSS 3.1
Exploited
Not listed
EPSS
—
Discovered by
Third party
Published by the vendor
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 |
|---|
No product mapping yet — this CVE is pending taxonomy review.
Vendor-reported affected versions (1)
- Cisco · Cisco Terminal Services Agent