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OPCFoundation OPC UA LocalDiscoveryServer (LDS)

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Overview

A vulnerability in the OPC Foundation's OPC UA LocalDiscoveryServer (LDS) could allow attackers to gain control of high-privilege terminal sessions during installation. This affects versions of the software prior to 1.04.420 and has been assigned CVE-2026-77477. To exploit this vulnerability, an attacker needs elevated privileges and access to the system during installation, potentially allowing them to execute arbitrary commands. This issue is particularly concerning for sectors like energy, chemical, and critical manufacturing, where the software is widely used. Users are advised to upgrade to version 1.04.420 or later to mitigate the risk.

Key Takeaways

  • Affected Systems: OPC Foundation OPC UA LocalDiscoveryServer (LDS) versions < 1.04.420
  • Action Required: Users should update to OPC UA LDS Installers version 1.
  • Timeline: Disclosed on 2026-09-03

Original Article Summary

View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to take control of a high-privilege terminal during installation and run arbitrary commands. The following versions of OPCFoundation OPC UA LocalDiscoveryServer (LDS) are affected: UA-LDS-Installers <1.04.420 (CVE-2026-77477) CVSS Vendor Equipment Vulnerabilities v3 4.6 OPCFoundation OPCFoundation OPC UA LocalDiscoveryServer (LDS) Execution with Unnecessary Privileges Background Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Water and Wastewater, Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-77477 An attacker can intercept a high-privilege console window launched during installation of the LDS. The attacker must be able to launch an installer with elevated privileges and have access to the keyboard and display while the installation is taking place. View CVE Details Affected Products OPCFoundation OPC UA LocalDiscoveryServer (LDS) Vendor: OPCFoundation Product Version: OPCFoundation UA-LDS-Installers: <1.04.420 Product Status: known_affected Remediations Mitigation OPCFoundation recommends users update to OPC UA LDS Installers 1.04.420 or later. Mitigation For more information about this vulnerability and its mitigation, see the OPCFoundation security advisory. https://github.com/OPCFoundation/OPC-SecurityAdvisories/tree/latest/csaf/2026/009 Relevant CWE: CWE-250 Execution with Unnecessary Privileges Metrics CVSS Version Base Score Base Severity Vector String 3.1 4.6 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N 4.0 2.4 LOW CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N Acknowledgments Lukas Schumaker of Rockwell Automation reported this vulnerability to OPCFoundation. OPCFoundation 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. 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely. Revision History Initial Release Date: 2026-09-03 Date Revision Summary 2026-09-03 1 Initial Publication Legal Notice and Terms of Use

Impact

OPC Foundation OPC UA LocalDiscoveryServer (LDS) versions < 1.04.420

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on 2026-09-03

Remediation

Users should update to OPC UA LDS Installers version 1.04.420 or later to mitigate this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Phishing, CVE, Exploit, and 3 more.

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