CVE-2025-47188 is a command injection vulnerability affecting Mitel SIP Phones, specifically the 6800 Series, 6900 Series, and 6900w Series, including the 6970 Conference Unit up to firmware version 6.4 SP4. The root cause is insufficient parameter sanitization in the device's handling of input data, which allows an unauthenticated attacker to inject and execute arbitrary commands within the phone's operating environment. This vulnerability does not require authentication or user interaction, making it particularly dangerous. Successful exploitation can lead to unauthorized disclosure or modification of sensitive configuration data stored on the device, potentially exposing network credentials or call routing information. Additionally, attackers could disrupt device availability or functionality, impacting voice communications. Given that these SIP phones are integral components of enterprise telephony infrastructure, exploitation could compromise the confidentiality, integrity, and availability of voice communications and related network segments. The absence of a CVSS score and known exploits in the wild indicates this is a newly disclosed vulnerability, but the technical details suggest a high-risk scenario due to the ease of exploitation and potential impact.

For European organizations, the impact of CVE-2025-47188 could be significant, especially for those relying heavily on Mitel telephony solutions for internal and external communications. Compromise of these devices could lead to interception or manipulation of sensitive voice communications, exposing confidential business information or personal data protected under GDPR. Disruption of phone services could impair operational continuity, particularly in sectors like finance, healthcare, and government where reliable communication is critical. Furthermore, compromised phones could serve as footholds for lateral movement within corporate networks, increasing the risk of broader cyberattacks. The vulnerability's unauthenticated nature means attackers could exploit it remotely if the devices are accessible from untrusted networks, raising the threat level for organizations with remote or hybrid work environments. The lack of known exploits currently provides a window for proactive mitigation before widespread attacks occur.

Organizations should immediately inventory their telephony infrastructure to identify affected Mitel 6800, 6900, and 6900w Series SIP phones, including the 6970 Conference Unit. Since no patch links are currently provided, it is critical to engage with Mitel support for firmware updates or official mitigation guidance. In the interim, restrict network access to these devices by implementing strict network segmentation and firewall rules to limit exposure to untrusted networks, especially the internet. Disable any unnecessary services or protocols on the phones to reduce attack surface. Monitor network traffic for unusual command execution patterns or configuration changes indicative of exploitation attempts. Employ intrusion detection systems tuned to detect anomalies in SIP traffic. Additionally, consider deploying endpoint detection and response (EDR) solutions on connected infrastructure to identify lateral movement attempts. Finally, establish an incident response plan specific to telephony infrastructure compromise to enable rapid containment and remediation.