CVE-2025-67822 is a security vulnerability identified in the Provisioning Manager component of Mitel MiVoice MX-ONE telephony systems, specifically versions 7.3.0.0.50 through 7.8 SP1 (7.8.1.0.14). The flaw stems from improper authentication mechanisms that allow an unauthenticated attacker to bypass normal authentication controls. This bypass means that an attacker does not need valid credentials or prior access to the system to gain entry. Once exploited, the attacker can access user or administrative accounts, potentially allowing full control over telephony provisioning functions. This can lead to unauthorized configuration changes, interception or redirection of calls, disruption of telephony services, or further lateral movement within the network. The vulnerability affects a critical component responsible for managing telephony provisioning, which is integral to enterprise communication infrastructure. No CVSS score has been assigned yet, and there are no known exploits actively used in the wild. However, the nature of the vulnerability suggests a significant risk due to the lack of authentication barriers. Mitel MiVoice MX-ONE is widely used in enterprise and government telephony systems, making this vulnerability particularly concerning for organizations relying on these platforms for secure communications. The vulnerability was published in January 2026, with the reservation date in December 2025, indicating recent discovery and disclosure. The absence of available patches at the time of disclosure necessitates immediate interim protective measures. The vulnerability's exploitation could compromise confidentiality, integrity, and availability of telephony services, impacting business operations and sensitive communications.

For European organizations, the impact of CVE-2025-67822 could be substantial, especially for those heavily dependent on Mitel MiVoice MX-ONE telephony systems for internal and external communications. Unauthorized access to provisioning functions can lead to interception or manipulation of calls, exposure of sensitive conversations, and disruption of communication services. This can affect business continuity, regulatory compliance (especially under GDPR regarding data confidentiality), and operational security. Critical sectors such as government, finance, healthcare, and telecommunications could face heightened risks due to the potential for espionage, fraud, or sabotage. The ability to bypass authentication without user interaction or credentials increases the likelihood of exploitation, potentially enabling attackers to move laterally within networks or establish persistent access. The lack of known exploits currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly following disclosure. The impact extends beyond confidentiality to integrity and availability, as attackers could alter provisioning settings or disrupt telephony services, causing operational outages or degraded service quality.

1. Implement strict network segmentation to isolate the Mitel MiVoice MX-ONE Provisioning Manager interface from general network access, limiting exposure to trusted management networks only. 2. Apply access control lists (ACLs) and firewall rules to restrict inbound connections to the provisioning component, allowing only authorized IP addresses and management stations. 3. Monitor network traffic and system logs for unusual or unauthorized access attempts targeting the provisioning interface. 4. Engage with Mitel support to obtain and apply security patches or updates as soon as they become available to address this vulnerability. 5. Employ multi-factor authentication (MFA) where possible on management interfaces to add an additional layer of security, even if the vulnerability bypasses authentication. 6. Conduct regular security audits and penetration testing focused on telephony infrastructure to identify and remediate potential weaknesses. 7. Develop and test incident response plans specific to telephony system compromises to ensure rapid containment and recovery. 8. Educate IT and security teams about this vulnerability and the importance of securing telephony provisioning systems. 9. Consider temporary disabling or restricting provisioning services if feasible until patches are applied. 10. Collaborate with vendors and industry groups to stay informed about emerging threats and mitigation strategies related to Mitel products.