Is CVE-2022-26143 in the CISA KEV catalog?

Yes. CVE-2022-26143 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25.

What is the CVSS severity of CVE-2022-26143?

CVE-2022-26143 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2022-26143?

CVE-2022-26143 has an EPSS score of 87.56% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-26143?

Upgrade micollab to 9.4 or later.

CVE & CISA-KEV Catalog

CVE-2022-26143

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

micollabNVD

Affected:< 9.4Fixed in:9.4CVE-2022-26143derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

87.56%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

MiCollab, MiVoice Business Express Access Control Vulnerability

A vulnerability has been identified in MiCollab and MiVoice Business Express that may allow a malicious actor to gain unauthorized access to sensitive information and services, cause performance degradations or a denial of service condition on the affected system.

Apply updates per vendor instructions.

Remediation due: 2022-04-15

References

Exploit1

arstechnica.com

Vendor Advisory1

mitel.com

Mitigation4

Third-Party Advisory1

news.ycombinator.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.