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.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Wed, 05 Aug 2026 17:00:00 +0000
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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. | |
| Title | Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability | |
| Weaknesses | CWE-266 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-08-05T17:19:46.116Z
Reserved: 2025-10-08T11:59:15.352Z
Link: CVE-2026-20028
Updated: 2026-08-05T17:19:43.317Z
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OpenCVE Enrichment
Updated: 2026-08-05T19:00:05Z