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tenable-operation-technology

An SSH misconfigurations exists in Tenable OT that led to the potential exfiltration of socket, port, and service information via the ostunnel user and GatewayPorts. This could be used to potentially glean information about the underlying system and give an attacker information that could be used to attempt to compromise the host.

CVE-2026-4433 identifies a security vulnerability in Tenable Operation Technology (OT) version 3.18.58, stemming from an SSH misconfiguration. Specifically, the issue involves the ostunnel user account and the GatewayPorts setting within the SSH configuration. GatewayPorts, when enabled improperly, can allow remote hosts to connect to forwarded ports, potentially exposing internal socket, port, and service information. This exposure can be exploited by attackers to gather detailed reconnaissance data about the underlying system, such as active services and network topology, which are valuable for planning subsequent attacks. The vulnerability is categorized under CWE-16, which relates to improper configuration management. The CVSS 4.0 base score is 1.9, reflecting a low severity due to limited impact and the requirement for low privileges and some user interaction. No authentication bypass or direct code execution is involved. No patches have been released yet, and no known exploits are reported in the wild. The vulnerability highlights the importance of secure SSH configuration, particularly in operational technology environments where exposure of internal network details can increase risk. The ostunnel user’s permissions and SSH GatewayPorts settings should be carefully audited and restricted to prevent unauthorized information disclosure.

Detailed information about CVE-2026-4433: CWE-16: Configuration in Tenable, Inc. Tenable Operation Technology affecting Tenable, Inc. Tenable Operation Technolo

CVE-2026-4433: CWE-16: Configuration in Tenable, Inc. Tenable Operation Technology - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-4433: CWE-16: Configuration in Tenable, Inc. Tenable Operation Technology

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