CVE-2022-26143

CVE-2022-26143 is a critical-severity vulnerability in Mitel Micollab with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-25). The underlying weakness is classified as CWE-306.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 9.0
• EPSS exploit prediction: 88% (100th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2022-03-25)
• EU (EUVD) id: EUVD-2022-30710
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-25)
• Weakness: CWE-306
• Affected product: Mitel Micollab
• Published: 2022-03-10
• Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.

How severe is CVE-2022-26143?

CVE-2022-26143 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-26143 being actively exploited?

Yes. CVE-2022-26143 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-25, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2022-26143?

CVE-2022-26143 primarily affects Mitel Micollab. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-26143?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2022-26143 have an EU (EUVD) identifier?

Yes. CVE-2022-26143 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-30710. It is also flagged as exploited in the EUVD (since 2022-03-25).

When was CVE-2022-26143 published?

CVE-2022-26143 was published on 2022-03-10 and last updated on 2026-06-17.

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

Affected products (4)

• cpe:2.3:a:mitel:micollab:*:*:*:*:*:-:*:*
• cpe:2.3:a:mitel:micollab:9.4:-:*:*:*:-:*:*
• cpe:2.3:a:mitel:micollab:9.4:sp1:*:*:*:-:*:*
• cpe:2.3:a:mitel:mivoice_business_express:*:*:*:*:*:*:*:*

More vulnerabilities in Mitel Micollab

• CVE-2024-35314 — Critical (CVSS 9.8): A vulnerability in the Desktop Client of Mitel MiCollab through 9.7.1.110, and MiVoice Business Solution Virtual…
• CVE-2024-35286 — Critical (CVSS 9.8): A vulnerability in NuPoint Messenger (NPM) of Mitel MiCollab through 9.8.0.33 allows an unauthenticated attacker to…
• CVE-2024-35285 — Critical (CVSS 9.8): A vulnerability in NuPoint Messenger (NPM) of Mitel MiCollab through 9.8.0.33 allows an unauthenticated attacker to…
• CVE-2022-41326 — Critical (CVSS 9.8): The web conferencing component of Mitel MiCollab through 9.6.0.13 could allow an unauthenticated attacker to upload…
• CVE-2022-36452 — Critical (CVSS 9.8): A vulnerability in the web conferencing component of Mitel MiCollab through 9.5.0.101 could allow an unauthenticated…
• CVE-2021-32071 — Critical (CVSS 9.8): The MiCollab Client service in Mitel MiCollab before 9.3 could allow an unauthenticated user to gain system access due…

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