CISA KEV · Known exploitedCritical

CVE-2022-26143

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 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: 9.8
EPSS: 87.2%
CISA KEV: Listed
Published: 2022.03.11

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability87.2%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Mitel MiCollab, MiVoice Business Express
Affected versions: < 9.4, 9.4, <= 8.1
Fixed versions: 9.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.04.15

1
Identify
Confirm that Mitel MiCollab, MiVoice Business Express and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-306, CWE-406
KEV added: 2022.03.25
Ransomware use: 미확인