What it is
CVE-2022-26143 is an unauthenticated vulnerability affecting Mitel MiCollab, MiVoice Business Express. The TP-240 (aka tp240dvr) component in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2022-26143
MiCollab Denial of Service
Mitel / MiCollab
- Severity
- CVSS 9.8 · Critical
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 87.2%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Mitel / MiCollab.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
MiCollab Denial of Service
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.
- Published
- 09 Mar 2022
- Exploitation Reported
- 25 Mar 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
nuclei_scanner
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2022-26143
- mitel.com/en-ca/support/security-advisories/mitel-prod... mitel.com · CVE Record https://www.mitel.com/en-ca/support/security-advisories/mitel-product...
- akamai.com/blog/security/phone-home-ddos-attack-vector akamai.com · CVE Record https://www.akamai.com/blog/security/phone-home-ddos-attack-vector
- shadowserver.org/news/cve-2022-26143-tp240phonehome-reflectio... shadowserver.org · CVE Record https://www.shadowserver.org/news/cve-2022-26143-tp240phonehome-refle...
- news.ycombinator.com/item news.ycombinator.com · CVE Record https://news.ycombinator.com/item?id=30614073
- blog.cloudflare.com/cve-2022-26143 blog.cloudflare.com · CVE Record https://blog.cloudflare.com/cve-2022-26143/
- team-cymru.com/blog/2022/03/08/record-breaking-ddos-potenti... team-cymru.com · CVE Record https://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential...
- arstechnica.com/information-technology/2022/03/ddosers-use-n... arstechnica.com · CVE Record https://arstechnica.com/information-technology/2022/03/ddosers-use-ne...
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Proof of concept available
Nuclei Templates
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-03-25 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nuclei template detected 01 Jun 2026.
View Nuclei template (opens in new tab)Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2022/CVE-2022-26143.yaml | 01 Jun 2026 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
9.8
Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
87.2%
All CVSS Scores
CVSS v3.1
9.8
Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
9.0
High
AV:N/AC:L/Au:N/C:P/I:P/A:C
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
Mitel MiCollab - Information Disclosure & Denial of Service
nuclei · Created Unknown
Timeline
From disclosure to observed exploitation
-
Public PoC available
Public proof-of-concept code published
-
Nuclei template available
Scanner coverage available
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2022-26143
Free JSON includes basic KEV fields{
"cve_id": "CVE-2022-26143",
"confidence": "Confirmed",
"cvss_score": 9.8,
"cvss_estimated": false,
"epss_score": 0.87212,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.