CVE-2026-20028
Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
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
Vendor advisory
cisco-sa-ts-agent-fw-bypass-MYBTMrev
Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
Cisco’s rating: Medium (advisory CVSS 5.0) · Published Aug 5, 2026
Bug ID: CSCws82513
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from