CVE-2022-26143

mitel micollab, mitel mivoice business express

Published 10 Mar 2022 · updated 17 Jun 2026 · Analyzed

9.8 Critical · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, with a remediation deadline of 15 Apr 2022 for US federal agencies.

Required action: Apply updates per vendor instructions.

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, Press/Media Coverage, Third Party Advisory
blog.cloudflare.com/cve-2022-26143/ · Mitigation, Third Party Advisory
news.ycombinator.com/item?id=30614073 · Issue Tracking, Third Party Advisory
team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/ · Broken Link, Mitigation, Third Party Advisory
www.akamai.com/blog/security/phone-home-ddos-attack-vector · Mitigation, Third Party Advisory
www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001 · Vendor Advisory
www.shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector/ · Mitigation, Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26143 · US Government Resource