CVE-2026-12562
Toptech Systems RCU II+ and Multiload II+ Missing Authentication for Critical Function
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | toptech systems |
| Product | rcu ii+ |
| Published | Jul 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Toptech Systems / RCU II+
0 < 2025-11-24
Toptech Systems / Multiload II+
0 < 2025-11-24
References
s3.amazonaws.com: https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.zip s3.amazonaws.com: https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.gz s3.amazonaws.com: https://s3.amazonaws.com/docs.toptech.com/index.html#downloads/Firmware/RCUII+_MLII+_SMPII+/ s3.amazonaws.com: https://s3.amazonaws.com/docs.toptech.com/nonpublic/2025%2012%2001%20RCU%20IIPlus%20MultiLoad%20IIPlus%20Vulnerability%20Notice.pdf cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-03 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-03.json
Credits
Donald Green of Southwest Research Institute reported this vulnerability to CISA.