# CVE-2022-26143

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.

- Page: https://www.vulneraibility.com/cve/CVE-2022-26143
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2022-03-25; CISA due date 2022-04-15
- EPSS: 87.33% (percentile 99.8)
- Detection templates only, no public exploit found: 1 Nuclei template
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-01-29)
- Weakness: CWE-306
- Published: 2022-03-10

## Affected

- mitel:micollab
- mitel:mivoice_business_express

## References

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

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.