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
| 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
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.
Affected Products
OPCFoundation OPC UA LocalDiscoveryServer (LDS)
OPCFoundation
OPCFoundation UA-LDS-Installers:
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 |