CVE-2022-26143: MiCollab, MiVoice Business Express Access Control Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-03-25. EPSS: 87.3% chance of exploitation in the next 30 days.

The TP-240 (aka tp240dvr) component in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1 allows remote attackers to obtain sensitive information and cause a denial of service (performance degradation and excessive outbound traffic). This was exploited in the wild in February and March 2022 for the TP240PhoneHome DDoS attack.

Affected products

• Mitel MiCollab: before 9.4 (fixed in 9.4); version 9.4 only
• Mitel MiVoice Business Express: up to and including 8.1

Published 2022-03-10. Last modified 2026-06-17.