CVE-2025-67822: Mitel MiVoice MX-ONE Auth Bypass Flaw

CVE-2025-67822 Overview

A critical authentication bypass vulnerability has been identified in the Provisioning Manager component of Mitel MiVoice MX-ONE, a widely deployed enterprise communications platform. This vulnerability allows unauthenticated attackers to bypass authentication mechanisms and gain unauthorized access to user or administrator accounts within the system. The flaw stems from improper authentication mechanisms (CWE-287) that fail to properly validate user credentials before granting access to protected resources.

Organizations utilizing Mitel MiVoice MX-ONE for their unified communications infrastructure should treat this vulnerability with high priority, as successful exploitation could lead to complete compromise of the telephony system, unauthorized access to sensitive communications, and potential lateral movement within enterprise networks.

Critical Impact

Unauthenticated attackers can bypass authentication to gain unauthorized access to user and admin accounts, potentially compromising the entire MiVoice MX-ONE communications infrastructure.

Affected Products

• Mitel MiVoice MX-ONE versions 7.3 (7.3.0.0.50) through 7.8 SP1 (7.8.1.0.14)
• Mitel MiVoice MX-ONE 7.8 (base version)
• Mitel MiVoice MX-ONE 7.8 SP1

Discovery Timeline

• January 15, 2026 - CVE-2025-67822 published to NVD
• January 21, 2026 - Last updated in NVD database

Technical Details for CVE-2025-67822

Vulnerability Analysis

This vulnerability resides in the Provisioning Manager component of Mitel MiVoice MX-ONE, which handles device provisioning and configuration management for the enterprise communications platform. The authentication bypass occurs due to improper authentication mechanisms that fail to adequately verify user identity before granting access to protected functionality.

The vulnerability is network-accessible, meaning attackers can exploit it remotely without requiring any prior authentication or user interaction. The attack complexity is low, making it relatively straightforward for threat actors to leverage this flaw. Successful exploitation can result in unauthorized access with the potential for significant confidentiality breaches, high-impact integrity violations through unauthorized configuration changes, and availability disruption to communication services.

Enterprise telephony systems like MiVoice MX-ONE are particularly attractive targets as they often contain sensitive communication logs, voicemail recordings, call routing configurations, and may provide pivot points into broader corporate networks.

Root Cause

The root cause of CVE-2025-67822 is classified as CWE-287 (Improper Authentication). The Provisioning Manager component fails to properly implement authentication controls, allowing attackers to circumvent the intended authentication process. This type of vulnerability typically occurs when authentication logic contains flaws such as:

• Missing authentication checks on sensitive endpoints
• Improper session validation allowing session prediction or fixation
• Logic flaws that permit bypassing credential verification
• Weak or missing authorization checks after initial authentication

The specific implementation details have not been publicly disclosed, but the vulnerability allows complete bypass of authentication controls to access both user and administrator-level accounts.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation without authentication or user interaction. An attacker with network access to the Mitel MiVoice MX-ONE Provisioning Manager interface can exploit this vulnerability to bypass authentication and gain unauthorized access to the system.

The exploitation scenario involves identifying exposed MiVoice MX-ONE Provisioning Manager instances on the network, crafting requests that exploit the improper authentication mechanisms, and gaining access to user or administrator accounts without valid credentials. Once authenticated, attackers could modify system configurations, access sensitive communication data, or disrupt telephony services.

Detection Methods for CVE-2025-67822

Indicators of Compromise

• Unusual login activity to Provisioning Manager accounts, particularly from unexpected IP addresses or at unusual times
• Authentication log entries showing successful access without corresponding valid credential submissions
• Administrative configuration changes made by accounts during periods when legitimate administrators were not active
• Anomalous API calls or requests to the Provisioning Manager component that deviate from normal operational patterns

Detection Strategies

• Implement network traffic monitoring for the Provisioning Manager interface, alerting on unusual connection patterns or request volumes
• Enable comprehensive authentication logging and audit trails on MiVoice MX-ONE systems to track all access attempts
• Deploy intrusion detection rules to identify authentication bypass attempts targeting Mitel MiVoice MX-ONE infrastructure
• Monitor for unauthorized configuration changes or new account creation on the telephony platform

Monitoring Recommendations

• Review Provisioning Manager access logs daily for signs of unauthorized access attempts or successful bypass events
• Implement SIEM correlation rules to detect authentication anomalies specific to Mitel MiVoice MX-ONE systems
• Configure alerts for administrative actions performed outside normal business hours or from non-standard network locations
• Establish baseline behavior profiles for Provisioning Manager usage to identify deviations indicative of compromise

How to Mitigate CVE-2025-67822

Immediate Actions Required

• Review the Mitel Security Advisory MISA-2025-0009 for official remediation guidance
• Restrict network access to the Provisioning Manager interface to trusted administrative networks only
• Implement additional authentication controls such as network segmentation, VPN requirements, or IP allowlisting for Provisioning Manager access
• Audit all existing user and administrator accounts for unauthorized access or suspicious activity

Patch Information

Mitel has released security guidance for this vulnerability. Organizations should consult the official Mitel Security Advisory MISA-2025-0009 for specific patch information and update instructions.

Affected versions include MiVoice MX-ONE versions 7.3 (7.3.0.0.50) through 7.8 SP1 (7.8.1.0.14). Organizations should prioritize upgrading to a patched version as specified in the vendor advisory.

Workarounds

• Isolate MiVoice MX-ONE Provisioning Manager interfaces from untrusted networks using firewall rules or network segmentation
• Implement a web application firewall (WAF) or reverse proxy with additional authentication requirements in front of the Provisioning Manager interface
• Enable enhanced logging and monitoring while awaiting patch deployment to detect potential exploitation attempts
• Consider disabling the Provisioning Manager interface temporarily if it is not critical to operations until patches can be applied

# Network isolation example - restrict Provisioning Manager access
# Example firewall rule to limit access to trusted admin networks
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Enable enhanced logging for authentication events
# Consult Mitel documentation for system-specific logging configuration