Mitel SIP Phones: Command Compatibility
- A critical security flaw discovered in mitel's SIP phone systems poses a significant threat to network security, prompting the company to release firmware updates.
- According to mitel's security advisory, a command smuggling vulnerability affects several SIP phone models, including the 6800, 6900, adn 6900W series, as well as the 6970 conference phone.
- This flaw could enable attackers to view or modify sensitive system and user data and configurations.
Mitel SIP Phone Vulnerabilities Expose Networks to Risk
Table of Contents
- Mitel SIP Phone Vulnerabilities Expose Networks to Risk
- Mitel SIP Phone Vulnerabilities: Your Questions Answered
- What are the biggest security risks associated with Mitel SIP phones?
- What is the Command Smuggling Vulnerability?
- How serious is the command Smuggling Vulnerability?
- What is the Second Vulnerability affecting Mitel SIP phones?
- How does this second vulnerability impact the phones?
- How can these vulnerabilities be exploited?
- What firmware versions are affected?
- What firmware versions fix these vulnerabilities?
- What actions does Mitel recommend to address these vulnerabilities?
- How can I protect my Mitel SIP phones?
- What happened with the Mirai botnet in relation to Mitel phones?
- How can I summarize the vulnerabilities and affected models?
A critical security flaw discovered in mitel’s SIP phone systems poses a significant threat to network security, prompting the company to release firmware updates. IT managers are urged to apply these updates promptly to mitigate potential risks.
Command Smuggling Vulnerability: A Critical Risk
According to mitel’s security advisory, a command smuggling vulnerability affects several SIP phone models, including the 6800, 6900, adn 6900W series, as well as the 6970 conference phone. The vulnerability, identified as CVE 2025-47188, with a CVSS score of 9.8, allows unauthorized attackers with network access to inject commands due to insufficient filtering of unnamed parameters.
This flaw could enable attackers to view or modify sensitive system and user data and configurations. Mitel has classified this risk as “critical.”
Second Vulnerability: Medium-Severity Threat
A second vulnerability, rated as medium severity, involves inadequate authentication mechanisms. This allows attackers to upload files, such as WAV files, to the affected devices without proper authorization (CVE 2025-41787, CVSS 5.3). While this could lead to the phone’s memory being filled, it reportedly does not impact the core functionality of the phones.
Mitigation and Recommendations
Exploitation of these vulnerabilities requires network access to the susceptible devices. Mitel advises that if the SIP phones are installed following their recommended guidelines, they should reside within a protected internal network, reducing the attack surface.
the affected series includes firmware versions R6.4.0.SP4 and older. Mitel states that version R6.4.0.SP5 and later versions address these vulnerabilities. The company strongly recommends that customers update to these newer versions as soon as possible.
Past Exploitation: Mirai Botnet
In January, evidence emerged that the Mirai botnet exploited security vulnerabilities in Mitel phones to establish a foothold for malware. This incident underscores the importance of adhering to Mitel’s installation recommendations and promptly applying security updates.
Mitel SIP Phone Vulnerabilities: Your Questions Answered
What are the biggest security risks associated with Mitel SIP phones?
The biggest security risks stem from vulnerabilities in Mitel SIP phone systems that could allow unauthorized access and control of your network.Recent findings have highlighted two main areas of concern.
What is the Command Smuggling Vulnerability?
The first and most critical vulnerability is a command smuggling flaw. According to Mitel’s security advisory, this vulnerability, identified as CVE 2025-47188, allows attackers to inject commands into affected phone models. This exploit occurs because of insufficient filtering of unnamed parameters.
Affected Models include:
- 6800 Series
- 6900 Series
- 6900W Series
- 6970 Conference Phone.
How serious is the command Smuggling Vulnerability?
The command smuggling vulnerability is classified as “critical” by Mitel, with a CVSS score of 9.8, indicating a very high risk. This flaw could enable attackers with network access to view or modify sensitive system and user data, potentially allowing the attacker to take full control of the phones and the information they access.
What is the Second Vulnerability affecting Mitel SIP phones?
The second vulnerability involves inadequate authentication mechanisms (CVE 2025-41787, CVSS 5.3). This medium-severity threat allows attackers to upload files, such as WAV files, to affected devices without proper authorization.
How does this second vulnerability impact the phones?
while the second vulnerability is rated as medium severity, it could still pose some issues.It is primarily related to the upload of files, potentially filling the phone’s memory.However,Mitel reports that it does not impact the core functionality of the phones.
How can these vulnerabilities be exploited?
exploitation of these vulnerabilities requires network access to the susceptible devices. This means an attacker would need to be on the same network as the Mitel SIP phones or have a way to access the network remotely.
What firmware versions are affected?
the affected firmware versions are R6.4.0.SP4 and older.
What firmware versions fix these vulnerabilities?
Mitel states that version R6.4.0.SP5 and later versions address these vulnerabilities.
What actions does Mitel recommend to address these vulnerabilities?
Mitel strongly recommends that customers update their SIP phones to newer firmware versions, specifically R6.4.0.SP5 or later,as soon as possible.
How can I protect my Mitel SIP phones?
to mitigate these risks,take these steps:
- Update Firmware: The most crucial step is to update your Mitel SIP phone firmware to version R6.4.0.SP5 or later.
- Network Security: According to Mitel, if your SIP phones are installed following their recommended guidelines, they should reside within a protected internal network .
What happened with the Mirai botnet in relation to Mitel phones?
In January, evidence emerged that the Mirai botnet exploited security vulnerabilities in Mitel phones to establish a foothold for malware. this incident highlights the importance of promptly applying security updates and adhering to Mitel’s installation recommendations.
How can I summarize the vulnerabilities and affected models?
Here’s a summary:
| Vulnerability | Severity | CVE | Affected Models | Mitigation |
|---|---|---|---|---|
| Command Smuggling | Critical (CVSS 9.8) | CVE 2025-47188 | 6800, 6900, 6900W, 6970 | Update to firmware R6.4.0.SP5 or later |
| Inadequate Authentication | Medium (CVSS 5.3) | CVE 2025-41787 | All potentially | Update to firmware R6.4.0.SP5 or later |