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

CISA Known Exploited Vulnerabilities

Name

MiCollab, MiVoice Business Express Access Control Vulnerability

Vendor

Mitel

Product

MiCollab, MiVoice Business Express

Added to the catalog

2022-03-25

Due date for US federal agencies

2022-04-15

Weaknesses

CWE-306, CWE-406

Catalog version

2026.10.30

A vulnerability has been identified in MiCollab and MiVoice Business Express that may allow a malicious actor to gain unauthorized access to sensitive information and services, cause performance degradations or a denial of service condition on the affected system.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://nvd.nist.gov/vuln/detail/CVE-2022-26143

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2022-03-10T17:47:32.813

Last modified

2026-06-17T04:34:46.337

Weaknesses

CWE-306

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

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

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:59.479Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2022-26143

CVE record

Assigner

mitre

State

PUBLISHED

Published

2022-03-09T15:32:54.000Z

Updated

2025-10-21T23:15:44.508Z

Problem types

n/a

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

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

Read on 2026-11-03T02:00:27.441Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2022/26xxx/CVE-2022-26143.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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