CVE-2026-12562

Root access via unauthenticated TCF debug service

Published Jul 30, 2026 · Updated Jul 30, 2026

Missing authentication in Toptech Systems RCU II+ and Multiload II+ before 2025-11-24 allows remote attackers to gain root access. The network-accessible Target Communications Framework debug service accepts connections without authentication and exposes the embedded Linux environment. Access from the device's local network permits filesystem changes, process control, network-interface manipulation, and arbitrary code execution as root.

CVSS severity8.7
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Toptech Systems RCU II+ and Multiload II+ before 2025-11-24 allows remote attackers to gain root access. The network-accessible Target Communications Framework debug service accepts connections without authentication and exposes the embedded Linux environment. Access from the device's local network permits filesystem changes, process control, network-interface manipulation, and arbitrary code execution as root.

The record

CVE
CVE-2026-12562
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
Toptech Systems
Product
RCU II+
Classifications
CWE-306, T0866
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2025-11-24

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Toptech Systems · RCU II+version=0 <2025-11-24
Toptech Systems · Multiload II+version=0 <2025-11-24

Published CVSS scores

8.7ICS-CERTCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8ICS-CERTCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0866Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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