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

> CVE-2022-26143: MiCollab, MiVoice Business Express Access Control Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2022-26143
Last updated: 2025-10-21T23:15:44Z

- Published: 2022-03-09 15:32 UTC · Updated: 2025-10-21 23:15 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 87.3%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-03-25, federal due date 2022-04-15, ransomware use: Unknown

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Mitel: MiCollab, MiVoice Business Express

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2022-26143)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2022-26143)
- [https://arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion/](https://arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion/)
- [https://blog.cloudflare.com/cve-2022-26143/](https://blog.cloudflare.com/cve-2022-26143/)
- [https://news.ycombinator.com/item?id=30614073](https://news.ycombinator.com/item?id=30614073)
- [https://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/](https://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/)
- [https://www.akamai.com/blog/security/phone-home-ddos-attack-vector](https://www.akamai.com/blog/security/phone-home-ddos-attack-vector)
- [https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001](https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001)
- [https://www.shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector/](https://www.shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2022-26143 · Markdown: https://rewindex.com/cve/CVE-2022-26143.md · JSON: https://rewindex.com/api/v1/cves/CVE-2022-26143 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:27.135Z