CVE-2020-12456

8.8 highEPSS 3.1%

High (8.8) in mitel mivoice connect client. EPSS 3.1% chance of exploitation in the next 30 days.

A remote code execution vulnerability in Mitel MiVoice Connect Client before 214.100.1223.0 could allow an attacker to execute arbitrary code in the chat notification window, due to improper rendering of chat messages. A successful exploit could allow an attacker to steal session cookies, perform directory traversal, and execute arbitrary scripts in the context of the Connect client.

Severity

CVSS 3.1

8.8 high

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

EPSS: 3.1% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-22
Published: 2020-08-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mitel:mivoice_connect_client

References

https://www.mitel.com/support/security-advisories
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-20-0006
https://www.mitel.com/support/security-advisories
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-20-0006

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