View CSAF Summary Successful exploitation of this vulnerability could result in an unauthenticated attacker modifying critical device settings or factory resetting the device. The following versions of Synectix LAN 232 TRIO are affected: LAN 232 TRIO vers:all/* (CVE-2026-1633) CVSS Vendor Equipment Vulnerabilities v3 10 Synectix Synectix LAN 232 TRIO Missing Authentication for Critical Function Background Critical Infrastructure Sectors: Critical Manufacturing, Emergency Services, Energy, Information Technology, Transportation Systems, Water and Wastewater Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-1633 The Synectix LAN 232 TRIO 3-Port serial to ethernet adapter exposes its web management interface without requiring authentication, allowing unauthenticated users to modify critical device settings or factory reset the device. View CVE Details Affected Products Synectix LAN 232 TRIO Vendor: Synectix Product Version: Synectix LAN 232 TRIO: vers:all/* Product Status: known_affected Remediations Mitigation The affected products should be considered end-of-life, as Synectix is no longer in business and therefore firmware fixes, mitigations and updates will be unavailable. Relevant CWE: CWE-306 Missing Authentication for Critical Function Metrics CVSS Version Base Score Base Severity Vector String 3.1 10 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Acknowledgments Souvik Kandar of MicroSec (microsec.io) reported this vulnerability to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as: Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-02-03 Date Revision Summary 2026-02-03 1 Initial Publication Legal Notice and Terms of Use