CVE-2024-31967: Mitel 6800 Series SIP Phones

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability on Mitel 6800 Series and 6900 Series SIP Phones through 6.3 SP3 HF4, 6900w Series SIP Phone through 6.3.3, and 6970 Conference Unit through 5.1.1 SP8 allows an unauthenticated attacker to conduct an unauthorized access attack due to improper access control. A successful exploit could allow an attacker to gain unauthorized access to user information or the system configuration.

Affected products

• Mitel 6800 Series SIP Phones: up to and including 6.3
• Mitel 6900 Series SIP Phones: up to and including 6.3.3
• Mitel 6970 Conference Unit: up to and including 5.1.1

Published 2024-05-02. Last modified 2026-06-17.