Toptech Systems RCU II+ and Multiload II+: 1 CVE, High 8.8
Summary
CISA reports 1 vulnerability in Toptech Systems RCU II+, Multiload II+. Weakness type: Missing Authentication for Critical Function. Successful exploitation of this vulnerability could allow an attacker to gain full system control and misuse it to access or manipulate connected networks and resources. Highest CVSS v3 score: 8.8 (High), exploitable from an adjacent network.
At a glance
- Vendor
- Toptech Systems
- Products
- RCU II+, Multiload II+
- CVEs
- CVE-2026-12562
- Highest CVSS v3
- 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Highest CVSS v4
- –
- Known exploited (KEV)
- No CVE from this advisory is on the KEV list as of the last refresh
- Sectors (per CISA)
- Energy
- Deployed
- Worldwide
- Vendor HQ
- United States
Vulnerabilities
| CVE | Weakness | CVSS v3 | CVSS v4 | KEV | Description (from advisory) |
|---|---|---|---|---|---|
| CVE-2026-12562 | Missing Authentication for Critical Function | 8.8 | – | No | 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… |
Affected products (2)
- Toptech Systems RCU II+: <2025-11-24
- Toptech Systems Multiload II+: <2025-11-24
Vendor fixes and mitigations (from advisory)
- Mitigation: Toptech Systems provides two methods for remediating affected RCU II+ and Multiload II+ units: First, move the device to a closed or segmented network without untrusted access.
- Mitigation: Run one of the RCU II+/Multiload II+ Vulnerability Removal Tools (VRT) available at https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.zip, https://s3.amazonaws.com/docs.toptech.com/nonpublic/rcuiip_mliip_vrt.gz. *-* This option does not require breaking Weights and Measures seals and has the least operational impact. link
- Mitigation: This option does not require breaking Weights and Measures seals and has the least operational impact.
- Mitigation: Install the latest firmware from https://s3.amazonaws.com/docs.toptech.com/index.html#downloads/Firmware/RCUII+_MLII+_SMPII+/. *-* This method requires stopping the bay and breaking the W&M seal. Be sure to back up the current ML configuration before performing the firmware update. link
- Mitigation: This method requires stopping the bay and breaking the W&M seal. Be sure to back up the current ML configuration before performing the firmware update.
- Mitigation: For questions, contact Toptech Systems Support at security@toptech.com. Additional details are available in Toptech System's firmware vulnerability notice: https://s3.amazonaws.com/docs.toptech.com/nonpublic/2025%2012%2001%20RCU%20IIPlus%20MultiLoad%20IIPlus%20Vulnerability%20Notice.pdf. link
Also apply CISA's standard ICS practices: minimize network exposure, keep control networks behind firewalls and isolated from business networks, and use up-to-date secure remote access.
Sources
This page is generated automatically from the CISA advisory text. It is not a substitute for the vendor's guidance; verify affected versions and fixes at the source before making changes to control systems.