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Exploited. On CISA's list since 2022-03-25.
CVE-2022-26143 · Mitel MiCollab, MiVoice Business Express · Published 2022-03-10
9.8 out of 10
CVSS rates it critical: about as damaging as flaws get.
87%
Estimated chance of exploitation in the next 30 days, among the top 1% of all scored flaws (EPSS, 2026-10-29).
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1659 days ago (2022-04-15).
Apply updates per vendor instructions.
A vulnerability has been identified in MiCollab and MiVoice Business Express that may allow a malicious actor to gain unauthorized access to sensitive information and services, cause performance degradations or a denial of service condition on the affected system.
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.
From the NVD.
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A sensitive function is reachable without proving who is using it.
CWE-306 · CISA KEV; NVD record: 134c704f-9b21-4f2e-91b3-4a467353bcc0; NVD record: nvd@nist.gov
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CWE-406 · CISA KEV. We have not selected a close learning match for this label.
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