Vulnerability Description
The RCU II+ and Multiload II+ are vulnerable to an unauthenticated service that exposes a debug interface granting full root-level access to the embedded system. This vulnerability stems from a network-accessible port running a Target Communications Framework (TCF) service that does not require any authentication, allowing an attacker to directly interact with the Linux environment that powers the device. Once connected, an attacker can freely view and modify the filesystem, manipulate running processes, and control network interfaces, enabling deep alteration of system behavior.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21
- https://s3.amazonaws.com/docs.toptech.com/index.html#downloads/Firmware/RCUII+_M
- https://s3.amazonaws.com/docs.toptech.com/nonpublic/2025%2012%2001%20RCU%20IIPlu
- https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.gz
- https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.zip
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-03
FAQ
What is CVE-2026-12562?
CVE-2026-12562 is a vulnerability with a CVSS score of 8.8 (HIGH). The RCU II+ and Multiload II+ are vulnerable to an unauthenticated service that exposes a debug interface granting full root-level access to the embedded system. This vulnerability stems from a net...
How severe is CVE-2026-12562?
CVE-2026-12562 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12562?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.