What’s Vulnerable › Vulnerabilities

CVE-2020-12456

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-26 · updated 2026-06-17
• Weakness: CWE-22

Description

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.

Affected products

• Mitel Mivoice Connect Client: before 214.100.1223.0 — fixed in 214.100.1223.0

How to fix

Upgrade to a fixed version: Mitel Mivoice Connect Client 214.100.1223.0. Check the vendor advisory for mitigations.

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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