CVE-2022-40765: Mitel MiVoice Connect Command Injection Vulnerability

CVE-2022-40765 is a command injection vulnerability in the Mitel Edge Gateway component of MiVoice Connect. An authenticated attacker who already has internal network access can execute operating-system commands in the context of the system. Because the flaw has been tied to known ransomware activity, organizations running this telephony platform should treat it as a high-priority risk that can lead to full host compromise and subsequent lateral movement.

Defenders need to confirm exact product versions and patch status against the vendor advisory, then move quickly to inventory, remediate, and monitor for signs of abuse.

How it works

The underlying weakness is CWE-77 (Improper Neutralization of Special Elements used in a Command). In this class of flaw, user-controlled input reaches a shell or command interpreter without adequate sanitization. An attacker who can authenticate and reach the Edge Gateway over the internal network supplies crafted input that the application concatenates into a system command. The injected payload then runs with the privileges of the vulnerable process, giving the attacker the ability to run arbitrary commands on the host.

No public exploit code or precise injection vector is described in the available facts; technical teams should treat any authenticated request that ultimately triggers a system call as a potential abuse path and validate behavior against the vendor’s own analysis.

Am I affected? How to find it in your systems

Mitel MiVoice Connect is typically deployed as an on-premises or hybrid voice-and-collaboration platform. The Edge Gateway component often sits at the boundary between the internal network and external SIP trunks or remote users, so it may appear on both management VLANs and voice VLANs.

• Inventory all hosts and virtual appliances that run MiVoice Connect or advertise Edge Gateway services; check asset-management databases, CMDB entries, and network discovery scans for Mitel-related banners or management ports.
• Confirm the installed software version and component list against the vendor advisory; any system that has not yet received the update named by Mitel should be treated as potentially vulnerable.
• Review authentication logs and administrative access records for the Edge Gateway. Look for unexpected successful logins from internal addresses followed by anomalous process creation, shell activity, or outbound connections that are atypical for a telephony appliance.
• If host-based monitoring or EDR is present, search for command-line activity originating from the Mitel service accounts or processes.

Because the attacker must already be authenticated and on the internal network, focus detection efforts on lateral-movement indicators rather than purely external scanning.

How to remediate

The primary remediation is to apply the updates published by Mitel for MiVoice Connect, following the vendor’s installation instructions exactly. After patching, reboot or restart the affected services as directed and verify that the new version is reported by the management interface.

• Enforce least-privilege accounts for all Edge Gateway administrative interfaces; remove or disable unused local accounts.
• Ensure that any remaining command-execution paths (scripts, diagnostic tools, or management APIs) perform strict input validation and avoid shell interpreters where possible.
• Segment the management plane of the Edge Gateway onto a dedicated, tightly controlled network and restrict access with firewall rules or ACLs that allow only authorized jump hosts.
• Enable and forward detailed audit logs from the appliance to a central SIEM so that any residual command-injection attempts can be detected.

If you can't patch immediately

Until the vendor update can be applied, reduce the attack surface with compensating controls that address the authenticated, internal-network nature of the vulnerability.

• Place the Edge Gateway behind network segmentation that limits which internal hosts can reach its management and service ports; require multi-factor authentication for any remaining administrative access.
• If a web application firewall or reverse-proxy sits in front of the management interface, enable virtual-patching rules that block common command-injection metacharacters and unexpected parameter values; tune carefully to avoid breaking legitimate traffic.
• Disable any non-essential Edge Gateway features or diagnostic endpoints that accept user input and could be abused for command execution, provided the business can tolerate the loss of functionality.
• Increase monitoring: alert on new process creation, shell invocations, or unusual network connections originating from the Mitel service accounts; retain packet captures of management traffic for later forensic review.

These measures buy time but do not eliminate the underlying flaw; schedule the official patch as soon as operational constraints allow.

If your data may have been exposed

Vulnerabilities that are known to be used by ransomware operators frequently lead to data theft or encryption. If you discover evidence of exploitation—or simply cannot rule it out—assume that credentials, call detail records, or configuration data may have left the environment. Rotate any secrets that resided on the affected system, review outbound traffic for exfiltration, and consider offering users a free exposure scan of their email addresses against known breach corpora so they can check whether their personal data has already appeared in public dumps.