Medium [CVE-2026-20028] Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability
This medium-severity Cisco advisory covers CVE-2026-20028 affecting Terminal Services Agent.
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Summary
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. The flaw is caused by an incorrect mapping of network connections to user accounts.
Affected product named by the advisory: Terminal Services Agent.
- Scope: At the time of publication, this vulnerability affected Cisco TS Agent, regardless of device configuration.
- Release Earlier than 1.4.3 (first fixed: 1.4.3)
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Earlier than 1.4.3: upgrade to 1.4.3.
- There are no workarounds that address this vulnerability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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