MiCollab, MiVoice Business Express Access Control Vulnerability

CRITICAL 9.8EXPLOITED (CISA KEV)CVE-2022-26143 · Published 10/03/2022 · updated 17/06/2026

MiCollab, MiVoice Business Express Access Control Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 25/03/2022. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
micollab mitel	`= 9.4< 9.4`	`9.4`
mivoice business express mitel	`≤ 8.1`	No fix yet

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.

References

arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion · Exploit
blog.cloudflare.com/cve-2022-26143 · Mitigation
news.ycombinator.com/item · Issue Tracking
team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143 · Broken Link
akamai.com/blog/security/phone-home-ddos-attack-vector · Mitigation
mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001 · Vendor Advisory
shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector · Mitigation
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2022-26143

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