What’s Vulnerable › Vulnerabilities

CVE-2026-12562: Toptech Systems RCU II+ and Multiload II+ Missing Authentication for Critical Function

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-09-08
• Weakness: CWE-306

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.

Affected products

• Toptech Systems Multiload II+: before 2025-11-24 — fixed in 2025-11-24
• Toptech Systems RCU II+: before 2025-11-24 — fixed in 2025-11-24

How to fix

Upgrade to a fixed version: Toptech Systems Multiload II+ 2025-11-24; Toptech Systems RCU II+ 2025-11-24. Check the vendor advisory for mitigations.

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-03.json
• https://s3.amazonaws.com/docs.toptech.com/index.html#downloads/Firmware/RCUII+_MLII+_SMPII+/
• https://s3.amazonaws.com/docs.toptech.com/nonpublic/2025%2012%2001%20RCU%20IIPlus%20MultiLoad%20IIPlus%20Vulnerability%20Notice.pdf
• 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

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