External risk intelligence

Thermalright TR-VISION HOME DLL Hijacking Privilege Escalation

CVE advisorySeverity: HIGH (CVSS 8.4)

CVE-2026-4255

This vulnerability is a local DLL search order hijacking issue. Exploitation requires the attacker to already have local access to the file system to place a malicious DLL and depends on the local execution of the affected software. It is not network-reachable and possesses no public internet exposure.

Thermalright Tr Vision Home

2.0.5 and earlier

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Thermalright TR-VISION HOME on Windows allows a local attacker to escalate privileges by placing a malicious file that is then loaded by the application. This occurs because the application does not verify the integrity of certain files it loads, and a user-writable directory is included in the application's search path.

Local attackers can gain elevated privileges.
It affects software running with administrative rights.
Confirm relevance and exposure for affected systems.

Attack Path

How an attacker could exploit the issue

An attacker with local access could exploit this vulnerability by placing a malicious DLL in a specific directory. When the affected application, running with administrative privileges, launches and searches for its required libraries, it would erroneously load the attacker's DLL instead of the legitimate one. This allows the attacker's code to run with elevated privileges.

Requires local system access.
Triggered by application launch.
Risk of arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

A local attacker could execute arbitrary code with administrative privileges on a Windows system running the affected application. This is possible when the attacker places a malicious DLL in a user-writable directory that is part of the application's search path, and then tricks a user into running the application, causing it to load the malicious code instead of a legitimate library.

System data or user data could be compromised.
Malicious DLLs could be loaded by the application.
Arbitrary code execution with elevated privileges.

Operational Fix

Recommended remediation, mitigation, and detection steps

Given this is a local privilege escalation vulnerability, the primary responsibility for assessment and remediation likely falls on the system owners or application support teams managing the Thermalright TR-VISION HOME software. The first practical step is to identify all systems running the affected software, determine if they are business-critical, and confirm the existence of any user-writable directories within the application's DLL search path.

Identify accountable system owners.
Verify software deployment locations.
Plan remediation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Thermalright TR-VISION HOME?

TR-VISION HOME is a software application designed for Windows systems. It is typically used for monitoring or controlling hardware components related to thermal management. Because the software requires administrative privileges to interact with system hardware, it operates at a higher permission level than standard user applications.

What does CWE-829 mean for CVE-2026-4255?

CWE-829 refers to inclusion of functionality from an untrusted control sphere. In the context of this CVE, it means the application is tricked into loading external code—specifically a DLL file—that it assumes is legitimate but is actually malicious. Because the software fails to verify the integrity or digital signature of the library before execution, it blindly runs the code provided by an attacker.

How is this DLL hijacking triggered?

An attacker triggers this by placing a malicious DLL file into a directory that the software searches when it starts. The application searches for required libraries using the default Windows order, which includes directories writable by non-privileged users. Crucially, the vulnerability does not trigger if the application only loads libraries from secure, protected system directories where a standard user cannot add or replace files.

Is my system at risk from the internet?

According to Halo Surface Signal, this vulnerability is considered internal and very unlikely to be reached from the internet. Because it is a local issue, an attacker must already have physical or remote access to the local file system to place the malicious file. There is no remote network trigger, meaning internet-facing systems are not uniquely targeted by this flaw compared to any other local device.

What steps should I take if I run this software?

Begin by creating an inventory of all systems where TR-VISION HOME is installed. Once identified, consult the official Thermalright support and download page to check for software updates that may include security hardening. Focus your efforts on systems with higher criticality and ensure you are monitoring for any unauthorized file modifications in directories associated with the application.

References

www.thermalright.com/support/download/

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.