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Known exploited vulnerability · CISA KEV

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

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.

CVE-2022-26143

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-25: attackers are using it right now.

CISA KEV
Listed
Added 2022-03-25 · federal fix-by 2022-04-15
EPSS (30 days)
87%
Higher than 99.8% of CVEs · 2026-11-01
CVSS v3.1
9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

MiCollab, MiVoice Business Express Access Control Vulnerability

Apply updates per vendor instructions.

NVD description · published 2022-03-10

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.

Full record on NVD

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How to check if you are exposed to CVE-2022-26143

  1. Find every Mitel MiCollab, MiVoice Business Express system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2022-26143.

US federal agencies had to fix this by 2022-04-15. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2022-26143. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Mitel Micollabbefore 9.4; 9.4; 9.4-sp1
Mitel Mivoice Business Expressup to and including 8.1

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 15 days after it was published
  3. · Fix-by date for US federal agencies, passed 1,661 days ago

Weakness type

More exploited Mitel vulnerabilities

CISA lists 7 exploited Mitel vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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