Security readout for executives and security teams
Plain-English summary
This flaw affects Mitel systems using the TP-240 component and can let unauthenticated remote attackers trigger sensitive information exposure and service degradation. It was used in the TP240PhoneHome DDoS activity in early 2022, so exposed systems should be treated as urgent legacy-risk assets.
Executive priority
Treat this as a high-priority remediation item for any exposed affected Mitel deployment. The business risk is not only local service outage; compromised exposure can contribute to large-scale DDoS traffic, creating operational, reputational, and provider-escalation risk.
Technical view
CVE-2022-26143 is a CWE-306 missing-authentication issue in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1. The CVSS 3.1 score is 9.8. Reported impacts include sensitive information disclosure, denial of service, performance degradation, and excessive outbound traffic.
Likely exposure
Exposure is most likely where affected Mitel MiCollab or MiVoice Business Express systems have the TP-240/tp240dvr component reachable by untrusted networks. The bundle does not provide a complete product inventory method, so asset validation should start with Mitel version and component checks.
Exploitation context
Exploitation in the wild is documented. The CVE description ties activity to February and March 2022 TP240PhoneHome DDoS attacks, and CISA lists CVE-2022-26143 in the Known Exploited Vulnerabilities catalog. Do not infer current active exploitation beyond those sources.
Researcher notes
The supplied CVE data names affected version boundaries and impacts, but not detailed root-cause internals or vendor patch mechanics. Public reporting from Akamai, Cloudflare, Shadowserver, Team Cymru, and Ars Technica centers on reflection/amplification DDoS behavior associated with TP240PhoneHome.
Mitigation direction
- Identify Mitel MiCollab and MiVoice Business Express deployments and confirm versions.
- Review Mitel advisory 22-0001 for vendor-approved remediation and upgrade guidance.
- Prioritize upgrading MiCollab before 9.4 SP1 FP1 systems.
- Apply compensating network controls where affected TP-240 services are exposed.
- Monitor for unusual outbound traffic or performance degradation from Mitel systems.
Validation and detection
- Inventory externally reachable Mitel systems and map them to affected versions.
- Confirm whether the TP-240/tp240dvr component is present or enabled.
- Check logs and network telemetry for abnormal outbound traffic patterns.
- Verify remediation status against Mitel advisory 22-0001.
- Track CISA KEV status in vulnerability management reporting.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-26143 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001CVE reference · x_refsource_MISC
- https://www.akamai.com/blog/security/phone-home-ddos-attack-vectorCVE reference · x_refsource_MISC
- https://www.shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector/CVE reference · x_refsource_MISC
- https://news.ycombinator.com/item?id=30614073CVE reference · x_refsource_MISC
- https://blog.cloudflare.com/cve-2022-26143/CVE reference · x_refsource_MISC
- https://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/CVE reference · x_refsource_MISC
- https://arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion/CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26143CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.