Action Required: Security Update for Select Mitel Products
Two recently discovered security vulnerabilities in the Linux operating system affect certain Mitel voice and collaboration platforms. If your organization uses Mitel products, here’s what you need to know and do.
What’s Happening
Security researchers identified two high-severity vulnerabilities (CVE-2026-43284 and CVE-2026-43500) in the Linux kernel—the foundation many communications systems run on. While an attacker would need authenticated access to exploit these issues, the potential impact includes unauthorized system access and service disruptions. Mitel has completed its assessment and identified which products are affected.
Is Your System Affected?
Affected products include:
· MiVoice Business (specific versions)
· MiVoice MX-ONE
· MiCollab
· MiVoice Border Gateway
· OpenScape Voice Server
· OpenScape Branch
· Other Linux-based Mitel platforms
NOT affected:
· Mitel 6800 and 6900 IP Phone Series
· Mitel 5634 Wi-Fi Phones
· Mitel IP-DECT solutions
· Most OpenScape endpoint devices
· Any Mitel products running on Windows
What You Need to Do
If you’re running affected products:
1. Review Mitel’s official security bulletin for your specific product and version
2. Apply recommended patches or updates as soon as they’re available
3. Contact your Mitel partner or support team if you need help identifying your version or applying updates
If your Mitel software runs on a customer-managed Linux server:
· Follow security updates from your Linux distribution provider (Red Hat, Ubuntu, SUSE, etc.)
· Mitel does not manage OS-level updates in these environments—your IT team or hosting provider handles this
If you’re running products on the “not affected” list:
· No immediate action required
· Continue following standard security practices
Why This Matters
Security vulnerabilities don’t take holidays, and prompt action reduces risk. Even vulnerabilities that require authenticated access can be exploited if an attacker gains initial entry through other means (phishing, weak passwords, etc.). Applying updates quickly—especially for internet-facing systems like collaboration platforms and border gateways—keeps your communications infrastructure secure.
What We’re Doing
We’re monitoring Mitel’s ongoing investigation and will notify you immediately if new guidance or updates become available. If you’re unsure whether your environment is affected or need assistance applying patches, reach out to us at [contact info/link].
Questions?
Don’t wait to confirm your status. Contact us today at [email/phone/link], and we’ll help you verify your Mitel environment and coordinate any necessary updates.
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