CVE-2025-64126 (CVSS 9.8) Zenitel TCIV-3+ Criti…

URGENT PATCH REQUIRED: Zenitel TCIV-3+ Intercoms Hit by Multiple Critical Flaws (CVSS 9.8)

Estimated reading time: 7 minutes

Key takeaways:

Zenitel has issued an urgent security advisory for TCIV-3+ intercoms.
Five distinct security vulnerabilities were identified, with three carrying a CVSS v3 base score of 9.8.
Vulnerabilities affect all versions of TCIV-3+ intercoms prior to version 9.3.3.0.
Immediate patching to version 9.3.3.0 or later is strongly recommended.
Proactive security measures, including vulnerability management and threat monitoring, are essential.

Table of Contents:

Zenitel TCIV-3+ Intercom Vulnerabilities: CVE Details
Impact and Mitigation
Practical Takeaways
PurpleOps and Proactive Security
Protecting Your Organization
FAQ

Zenitel TCIV-3+ Intercom Vulnerabilities: CVE Details

Zenitel has issued an urgent security advisory, also reported by CISA, addressing critical vulnerabilities in its TCIV-3+ intercom station. This post details the nature of these flaws, their potential impact, and necessary steps to mitigate the risks. The advisory highlights five distinct security vulnerabilities, with three carrying the maximum severity CVSS v3 base score of 9.8.

The core issue revolves around vulnerabilities affecting all versions of TCIV-3+ intercoms prior to version 9.3.3.0. Exploitation of these vulnerabilities “could result in arbitrary code execution or cause a denial-of-service condition.” Given the prevalence of intercom systems in various security contexts, understanding and addressing these vulnerabilities is crucial for maintaining the integrity of connected systems and overall security posture. A proactive approach to vulnerability management, including threat monitoring and rapid patching, is essential in defending against potential exploits targeting these critical devices.

The most critical threats are identified as three separate instances of OS Command Injection vulnerabilities: CVE-2025-64126, CVE-2025-64127, and CVE-2025-64128. Each of these vulnerabilities scores a CVSS of 9.8, indicating maximum severity.

These vulnerabilities arise from insufficient validation of user-supplied input, creating opportunities for attackers to inject malicious commands. Specifically:

CVE-2025-64126: This vulnerability exists because the application “accepts a parameter directly from user input without verifying it is a valid IP address or filtering potentially malicious characters.” This could allow an unauthenticated attacker to inject arbitrary commands, potentially compromising the entire system.
CVE-2025-64127: This vulnerability is caused by “insufficient sanitization of user-supplied input,” where parameters are later “incorporated into OS commands without adequate validation.” This could allow an unauthenticated attacker to execute arbitrary commands remotely, gaining unauthorized access to the device and potentially the network it resides on.
CVE-2025-64128: This vulnerability stems from “incomplete validation of user-supplied input,” which “could permit attackers to append arbitrary data” and “inject arbitrary commands.” The ability to append arbitrary data allows attackers to manipulate system behavior and execute malicious code.

In addition to the command injection flaws, the advisory also details two other high-impact vulnerabilities:

Cross-Site Scripting (XSS) (CVE-2025-64130): This reflected XSS flaw is also rated at a CVSS of 9.8. It “could allow a remote attacker to execute arbitrary JavaScript on the victim’s browser.” Successful exploitation of this vulnerability could lead to session hijacking, defacement, or the redirection of users to malicious websites.
Out-of-Bounds Write (CVE-2025-64129): Rated at CVSS 7.6, this vulnerability “could allow a remote attacker to crash the device.” While not as severe as remote code execution, a denial-of-service condition can disrupt critical communication and create security gaps.

Impact and Mitigation

The potential impact of these vulnerabilities is significant. The ability to execute arbitrary code remotely (CVE-2025-64126, CVE-2025-64127, CVE-2025-64128) allows attackers to gain complete control over the affected intercom system. This control can be used to eavesdrop on communications, manipulate access control, or even use the intercom as a launchpad for further attacks within the network. The high CVSS scores associated with these vulnerabilities underscore the urgency of applying the necessary patches.

The XSS vulnerability (CVE-2025-64130) poses a risk to users interacting with the intercom’s web interface. Attackers could inject malicious scripts into web pages served by the intercom, potentially stealing user credentials or spreading malware. While the out-of-bounds write vulnerability (CVE-2025-64129) may only lead to a denial-of-service condition, it can still disrupt critical communications and create security vulnerabilities.

Zenitel strongly recommends users to “upgrade to Version 9.3.3.0 or later.” Given the potential for unauthenticated remote code execution (CVSS 9.8), patching is essential for maintaining the security and availability of these critical communication devices. Delaying the update leaves systems vulnerable to exploitation and compromises the overall security infrastructure.

Practical Takeaways

Technical Readers:

Immediate Patching: Prioritize upgrading all Zenitel TCIV-3+ intercom stations to version 9.3.3.0 or later. This action is critical to remediate the identified vulnerabilities.
Input Validation: Review any custom integrations or configurations that interact with the intercom system. Ensure that all user-supplied input is properly validated and sanitized to prevent command injection attacks.
Network Segmentation: Isolate intercom systems on a separate network segment to limit the potential impact of a successful attack. This can prevent attackers from using compromised intercoms to pivot to other critical systems.
Intrusion Detection: Implement intrusion detection systems (IDS) to monitor network traffic for suspicious activity related to the exploitation of these vulnerabilities. Look for patterns indicative of command injection or cross-site scripting attacks.
Firmware Management: Establish a robust firmware management process for all IoT devices, including regular security audits and timely patching.

Non-Technical Readers:

Communicate Urgency: Ensure that IT and security teams are aware of the severity of these vulnerabilities and the need for immediate patching.
Verify Patching: Confirm that all Zenitel TCIV-3+ intercom stations have been updated to the latest version. Request documentation or reports to verify the patching process.
Security Awareness: Educate employees about the risks of clicking on suspicious links or entering sensitive information into untrusted websites. This can help prevent XSS attacks and other social engineering tactics.
Vendor Management: Establish a process for monitoring security advisories from vendors of critical systems. This will enable you to proactively address vulnerabilities and mitigate potential risks.
Incident Response Plan: Ensure that the organization has an incident response plan in place to address security breaches. This plan should include steps for identifying, containing, and recovering from attacks.

PurpleOps and Proactive Security

The vulnerabilities highlighted in the Zenitel TCIV-3+ intercoms underscore the importance of proactive cybersecurity measures. Companies must adopt a multi-layered approach to security that includes vulnerability management, threat monitoring, and incident response. PurpleOps offers a range of services designed to help organizations strengthen their security posture and mitigate the risks of cyberattacks.

Our services can assist in identifying and addressing vulnerabilities such as those found in the Zenitel TCIV-3+ intercoms. Our cyber threat intelligence platform provides real-time insights into emerging threats, allowing organizations to proactively defend against attacks. Through dark web monitoring service and telegram threat monitoring, PurpleOps gives you visibility into threat actor discussions and potential exploits targeting your organization. Additionally, our supply-chain risk monitoring service helps you assess and manage the security risks associated with third-party vendors.

PurpleOps’ capabilities extend to breach detection and brand leak alerting, ensuring you’re immediately aware of any unauthorized access or data breaches that could compromise your systems or reputation. Our underground forum intelligence and live ransomware API deliver critical information needed to stay ahead of evolving cyber threats.

Protecting Your Organization

The critical vulnerabilities in Zenitel TCIV-3+ intercoms serve as a reminder of the constant need for diligent security practices. Addressing these vulnerabilities requires immediate action.

To learn more about how PurpleOps can help you protect your organization from cyber threats, visit our platform page or contact us for more information on our PurpleOps Solutions. Explore our expertise in red team operations and . Also, see how we address supply chain risks and provide ransomware protection, including dark web monitoring and cyber threat intelligence.

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Tags: Command Injection CVSS 9.8 Intercom Security Remote Code Execution TCIV-3+ Unauthenticated Attack XSS Zenitel