CVE-2022-26143

MiCollab, MiVoice Business Express Access Control

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 87.3%

Published10 Mar 2022
Added to CISA KEV25 Mar 2022
Remediation due15 Apr 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mitel Micollab< 9.4 · 9.4

Mitel Mivoice Business Express≤ 8.1

Remediation

Fixed in

Mitel Micollab≥ 9.4

Patch & vendor advisories

https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001

References

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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2022-26143 being actively exploited?

Yes. CVE-2022-26143 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Mar 2022.

How severe is CVE-2022-26143?

CVE-2022-26143 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 87.3% probability of exploitation.

Which products are affected by CVE-2022-26143?

Affected products include Mitel Micollab, Mitel Mivoice Business Express.

How do I fix CVE-2022-26143?

Upgrade affected software to a fixed version, for example Mitel Micollab 9.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-26143 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.