# CVE-2022-26143: MiCollab, MiVoice Business Express Access Control Vulnerability

Source: https://junglewise.ai/threats/cve-2022-26143-micollab-mivoice-business-express-access-control-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-25. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2022-26143 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-03-25

The TP-240 (tp240dvr) component in Mitel MiCollab and MiVoice Business Express contains an access control vulnerability due to missing authentication. Remote attackers can exploit this to obtain sensitive information or trigger a denial of service via excessive outbound traffic, which has been used in 'TP240PhoneHome' reflection/amplification DDoS attacks.

Technologies: [Mitel MiCollab](https://junglewise.ai/threats/technologies/micollab), [Mitel MiVoice Business Express](https://junglewise.ai/threats/technologies/mivoice-business-express). Vendors: [Mitel](https://junglewise.ai/threats/vendors/mitel).

## Quick answers

**Is CVE-2022-26143 exploited in the wild?** Yes. CVE-2022-26143 is known to be exploited in the wild, first recorded on 25 March 2022. Treat it as urgent.

**How severe is CVE-2022-26143?** Critical severity, with a CVSS score of 9.8, published 25 March 2022.

**Which products and versions are affected?** Mitel MiCollab before 9.4 SP1 FP1; Mitel MiVoice Business Express through 8.1.

**Is there a fix for CVE-2022-26143?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2022-26143 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2022-26143?** Check whether you run Mitel MiCollab or Mitel MiVoice Business Express. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Mitel MiCollab before 9.4 SP1 FP1
- Mitel MiVoice Business Express through 8.1

## Timeline

- 2022-02: exploited: Exploitation first observed in the wild.
- 2022-03-08: disclosed: Public disclosure of the TP240PhoneHome DDoS attack vector.
- 2022-03-25: advisory: Mitel advisory and CISA KEV addition.
- 2022-03-25: kev added: Added to CISA Known Exploited Vulnerabilities catalog.

## Related threats

- [Mitel MiCollab Path Traversal Vulnerability](https://junglewise.ai/threats/cve-2024-55550-mitel-micollab-path-traversal-vulnerability)
- [Mitel MiCollab Path Traversal Vulnerability](https://junglewise.ai/threats/cve-2024-41713-mitel-micollab-path-traversal-vulnerability)