TeamViewer Clients Vulnerability Leads to Privilege Escalation

TeamViewer, a widely used remote access software, has announced a critical vulnerability in its Windows clients.

The company disclosed on January 28, 2025, that its software is affected by a security flaw that could allow local attackers to escalate privileges.

The vulnerability tracked as CVE-2025-0065, has been assigned a Common Vulnerability Scoring System (CVSS) rating of 7.8, placing it in the “High” severity range.

Details of CVE-2025-0065: Improper Neutralization of Argument Delimiters

The vulnerability resides in the TeamViewer_service.exe component of TeamViewer Full Client and Host on Windows systems.

It is classified as CWE-88: Improper Neutralization of Argument Delimiters in a Command (‘Argument Injection’).

An attacker with local, unprivileged access to a Windows system could exploit this flaw by injecting malicious arguments into the vulnerable component, ultimately escalating their privileges.

While this vulnerability does not allow for remote exploitation, it poses a significant risk in shared or multi-user environments, such as corporate networks or publicly accessible systems.

Fortunately, TeamViewer confirmed that, to date, there is no evidence that this vulnerability has been exploited in the wild.

Affected Products and Versions

The vulnerability impacts a range of TeamViewer products for Windows, including:

• TeamViewer Full Client (Windows): Versions earlier than 15.62, 14.7.48799, 13.2.36226, 12.0.259319, and 11.0.259318.
• TeamViewer Host (Windows): Versions earlier than 15.62, 14.7.48799, 13.2.36226, 12.0.259319, and 11.0.259318.

Users running any of these older versions are strongly urged to upgrade immediately.

TeamViewer has released version 15.62 to address this issue. The company recommends users update their software to the latest available version as soon as possible.

Updated versions can be downloaded from TeamViewer’s official website. For organizations managing multiple installations, TeamViewer Tensor customers are advised to prioritize these updates across their systems to prevent potential exploitation.

The vulnerability was identified by an anonymous contributor working with Trend Micro Zero Day Initiative and responsibly disclosed to TeamViewer.

This collaboration highlights the importance of coordinated disclosure efforts in maintaining software security. TeamViewer’s proactive approach to addressing the vulnerability underscores its commitment to ensuring the safety of its users. 

TeamViewer users are advised to stay informed about security updates and implement best practices, such as restricting physical access to devices and monitoring privilege use, to further mitigate risks.

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