CVE-2022-26143
CriticalExploitedPublic exploitThe 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).
Published Mar 10, 2022 · Updated Nov 3, 2025
Key Facts
Patch immediately- CVE-2022-26143 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Micollab (Mitel), Mivoice Business Express (Mitel).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 8, 2022. Public exploit code is available.
- EPSS estimates a 87% probability of exploitation in the next 30 days.
- Fixed versions are available, including Micollab 9.4, Mivoice Business Express <=8.1, Mivoice Business Express 8.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
87%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-26143 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 25, 2022 | Apr 15, 2022 | Not reported |
| Industry KEV feed | Mar 8, 2022 | Apr 15, 2022 | Not reported |
| CIRCL KEV | Mar 25, 2022 | Apr 15, 2022 | Not reported |
| ENISA EUVD | Mar 25, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| MicollabMitel | 9.4, 9.4-sp1 | 9.4 |
| Mivoice Business ExpressMitel | See advisory | 8.1 |
Patched Releases
Micollab
9.4
Mivoice Business Express
<=8.1
Timeline
Added to Industry KEV feed
Mar 8, 2022
Publicly disclosed
Mar 10, 2022
Added to CISA KEV
Mar 25, 2022
Added to CIRCL KEV
Mar 25, 2022
Added to ENISA EUVD
Mar 25, 2022
Last updated
Nov 3, 2025
Weakness Type
- CWE-306 Missing Authentication for Critical Function
References
- advisoryhttps://blog.cloudflare.com/cve-2022-26143/
- advisoryhttps://news.ycombinator.com/item?id=30614073
- advisoryhttps://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/
- advisoryhttps://www.akamai.com/blog/security/phone-home-ddos-attack-vector
- advisoryhttps://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001
FAQ
Common Questions.
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).
Affected: Micollab (Mitel) versions 9.4, 9.4-sp1; Mivoice Business Express (Mitel). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 8, 2022.
Yes. It was added on Mar 25, 2022 with a federal remediation due date of Apr 15, 2022.
Public exploit code is available.
Fixed versions are available, including Micollab 9.4, Mivoice Business Express <=8.1, Mivoice Business Express 8.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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