What’s Vulnerable › Vulnerabilities
CVE-2022-26143: MiCollab, MiVoice Business Express Access Control Vulnerability
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: yes — in CISA KEV since 2022-03-25
- EPSS: 87.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2022-03-10 · updated 2026-06-17
- Weakness: CWE-306
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.
Affected products
- Mitel Micollab: before 9.4; 9.4, 9.4-sp1 — fixed in 9.4
- Mitel Mivoice Business Express: through 8.1
How to fix
Upgrade to a fixed version: Mitel Micollab 9.4. Check the vendor advisory for mitigations.
References
- 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://news.ycombinator.com/item?id=30614073
- 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.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://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://news.ycombinator.com/item?id=30614073
- 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
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