High severity · published Jul 30, 2026
CVE-2026-12562
Toptech Systems RCU II+ and Multiload II+ Missing Authentication for Critical Function
8.8
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
Multiload II+ · Toptech Systems
before 2025-11-24 · source: vendor
RI
RCU II+ · Toptech Systems
before 2025-11-24 · source: vendor
In the news
VulnerabilityHigh
Toptech Systems RCU II+ and Multiload II+
View CSAF
Summary
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.
The following versions of Toptech Systems RCU II+ and Multiload II+ are affected:
RCU II+ <2025-11-24 (CVE-2026-12562)
Multiload II+ <2025-11-24 (CVE-2026-12562)
CVSS
Vendor
Equipment
Vulnerabilities
v3 8.8
Toptech Systems
Toptech Systems RCU II+ and Multiload II+
Missing Authentication for Critical Function
Background
Critical Infrastructure Sectors: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States
Vulnerabilities
Expand All +
CVE-2026-12562
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.
View CVE Details
Affected Products
Toptech Systems RCU II+ and Multiload II+
Vendor: Toptech Systems
Product Version: ...
Jul 30, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12562
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12562
github.com
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-03.json
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
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/nonpublic/rcuiip_mliip_vrt.zip
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-03
