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…
Browse: All 2022 CVEs · All vendors
- CVSS score
- 9.8 Critical
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- CISA KEV
- Yes — actively exploited (added 2022-03-25, remediation due 2022-04-15)
- Weakness (CWE)
- CWE-306
- Published
- 2022-03-10
- Last modified
- 2026-06-17
- NVD status
- Analyzed
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
- mitel mivoice business express
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
Required action (CISA)
Apply updates per vendor instructions. Federal remediation deadline: 2022-04-15.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score. For the actively exploited vulnerabilities that matter this week, read The Exploit HQ daily security brief.
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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26143
FAQ
Is CVE-2022-26143 actively exploited?
Yes. CISA added CVE-2022-26143 to its Known Exploited Vulnerabilities (KEV) catalog on 2022-03-25, with a federal remediation deadline of 2022-04-15. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2022-26143?
CVE-2022-26143 has a CVSS base score of 9.8 (Critical). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Related vulnerabilities
- CVE-2024-41710 — Mitel SIP Phones
- CVE-2024-55550 — Mitel MiCollab
- CVE-2024-41713 — Mitel MiCollab
- CVE-2022-41223 — Mitel MiVoice Connect
- CVE-2022-40765 — Mitel MiVoice Connect
- CVE-2022-29499 — Mitel MiVoice Connect
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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