CVE-2024-31963
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability on Mitel 6800 Series and 6900 Series SIP Phones through 6.3 SP3 HF4, 6900w Series SIP Phone through 6.3.3, and 6970 Conference Unit through 5.1.1 SP8 allows an authenticated attacker to conduct a buffer overflow attack due to insufficient bounds checking and input sanitization. A successful exploit could allow an attacker to gain access to sensitive information, modify system configuration or execute arbitrary commands within the context of the system.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceBuffer overflow vulnerability in Mitel 6800/6900 Series SIP Phones and 6970 Conference Unit firmware allows authenticated attackers to execute arbitrary commands, access sensitive information, or modify system configuration due to insufficient bounds checking and input sanitization in the SIP processing component.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Physical
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify your Mitel phone or conference unit modelCheck the device label or log into the web administration interface to confirm whether the device is a Mitel 6800 Series, 6900 Series SIP Phone, or 6970 Conference Unit. Note the exact model number shown in the device information or system status page.Affected if The model is NOT one of these three: 6800 Series, 6900 Series, or 6970 Conference Unit.
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Determine the installed firmware versionIn the web admin interface, navigate to the Status or System Information page to view the firmware version. Alternatively, send a SIP OPTIONS request to the device or check the boot log via console/SFTP. Record the version number displayed (for example: 6.3.0, 6.3 SP3, 5.1.1).Affected if You cannot determine the firmware version or the device does not respond to administrative queries.
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Verify SIP protocol is enabledIn the web admin interface under SIP settings or Phone configuration, confirm that SIP protocol support is turned ON. The vulnerability exists in the SIP processing component, so if SIP is disabled and the device is not using SIP for calls, the attack surface may not apply.Affected if SIP is explicitly disabled and the device uses a different protocol exclusively.
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Compare firmware version against affected rangesFor 6800/6900 Series phones, check if version is earlier than 6.3 SP3 HF4. For 6900w models, check if earlier than 6.3.3. For 6970 Conference Units, check if earlier than 5.1.1 SP8. Compare your recorded version string from step 2 against these thresholds.Affected if The installed firmware version falls within the affected range: 6800/6900 below 6.3 SP3 HF4, 6900w below 6.3.3, or 6970 below 5.1.1 SP8.
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Confirm administrative access is exposedCheck whether the web management interface or administrative SIP ports are accessible from untrusted networks. The vulnerability requires an authenticated attacker, so determine if the device admin credentials could be compromised or if the management interface is reachable from outside your VLAN.Affected if The device admin interface or SIP port 5060 is accessible from networks outside your isolated voice VLAN.
Your environment is affected if you have a Mitel 6800/6900 Series phone or 6970 Conference Unit running firmware below the patched versions (6.3 SP3 HF4, 6.3.3, or 5.1.1 SP8 respectively) with SIP enabled and administrative access potentially exposed to attackers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedApply vendor patches for affected versions (6.3 SP3 HF4 for 6800/6900, 6.3.3 for 6900w, 5.1.1 SP8 for 6970). If patches unavailable, segment SIP phones on isolated VLANs and restrict management interface access to authorized personnel only.
Contact Mitel for fixed firmware versions (the vendor has released patches beyond 6.3 SP3 HF4 for 6800/6900 Series, beyond 6.3.3 for 6900w Series, and beyond 5.1.1 SP8 for 6970 Conference Unit)
- Contact Mitel Technical Support to obtain the specific firmware patches for your device models (6800/6900 Series SIP Phones, 6900w Series, 6970 Conference Unit)
- Confirm your current firmware version by accessing the phone's web interface or administrative console
- Request and apply the appropriate fixed firmware version from Mitel - the vendor has released patches addressing this vulnerability in the mentioned product lines
- After applying the patch, verify the firmware version has been updated successfully
- Restart the device to ensure the patch takes effect
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-31963 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-31963 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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