Answer in brief
CVE-2026-20028 records a Medium severity (CVSS 5.0) vulnerability in Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Terminal Services Agent (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Terminal Services Agent (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Terminal Services Agentgeneric | TSAgent-1.3 || TSAgent-1.4.2 || TSAgent-1.2 || TSAgent-1.4 || TSAgent-1.0 || TSAgent-1.4.1 || TSAgent-1.1 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-20028 records a Medium severity (CVSS 5.0) vulnerability in Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Terminal Services Agent (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Terminal Services Agent (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Terminal Services Agentgeneric | TSAgent-1.3 || TSAgent-1.4.2 || TSAgent-1.2 || TSAgent-1.4 || TSAgent-1.0 || TSAgent-1.4.1 || TSAgent-1.1 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.