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

Quick assessment

Affected
Toptech Systems RCU II+
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Toptech Systems RCU II是Toptech Systems的一款工业自动化控制设备。 Toptech Systems RCU II+和Multiload II+ 2025-11-24之前版本存在授权问题漏洞，该漏洞源于网络可达端口运行Target Communications Framework (TCF)服务且无需身份验证，可能导致攻击者直接与Linux环境交互，查看和修改文件系统、操作运行进程、控制网络接口，实现深度修改系统行为。

CVSS 8.8 · High EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 2

VendorProduct Version RangeStatus
Toptech Systems Multiload II+ < 2025-11-24 affected
Toptech Systems RCU II+ < 2025-11-24 affected
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I. Basic Information for CVE-2026-12562

Vulnerability Information
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Vulnerability Title
Toptech Systems RCU II+ and Multiload II+ Missing Authentication for Critical Function
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Toptech Systems RCU II 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Toptech Systems RCU II是Toptech Systems的一款工业自动化控制设备。 Toptech Systems RCU II+和Multiload II+ 2025-11-24之前版本存在授权问题漏洞，该漏洞源于网络可达端口运行Target Communications Framework (TCF)服务且无需身份验证，可能导致攻击者直接与Linux环境交互，查看和修改文件系统、操作运行进程、控制网络接口，实现深度修改系统行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Toptech Systems RCU II+ 0 ~ 2025-11-24 -
Toptech Systems Multiload II+ 0 ~ 2025-11-24 -

II. Public POCs for CVE-2026-12562

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III. Intelligence Information for CVE-2026-12562

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Vendor Advisories for CVE-2026-12562 (1)

Vendor Pages for CVE-2026-12562 (1)

Other References for CVE-2026-12562 (1)

Other References for CVE-2026-12562 (2)

IV. Related Vulnerabilities

Same vendor: Toptech Systems
Same weakness: CWE-306

V. Comments for CVE-2026-12562

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