CVE-2020-27639
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 · uneditedThe Bluetooth handset of Mitel MiVoice 6873i, 6930, and 6940 SIP phones with firmware before 5.1.0.SP6 could allow an unauthenticated attacker within Bluetooth range to pair a rogue Bluetooth device when a phone handset loses connection, due to an improper pairing mechanism. A successful exploit could allow an attacker to eavesdrop on conversations.
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 confidenceThe Mitel MiVoice 6873i, 6930, and 6940 SIP phones have an improper Bluetooth pairing mechanism in the handset firmware prior to 5.1.0.SP6. When the phone handset loses connection, an unauthenticated attacker within Bluetooth range can exploit the flawed pairing process to connect a rogue Bluetooth device, enabling eavesdropping on audio conversations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 5.1.0= 5.1.0< 5.1.0= 5.1.0< 5.1.0= 5.1.0CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 the phone modelAccess the phone's web interface (http://<phone_ip>) or check the physical device label to confirm the model is one of: 6873i, 6930, or 6940Affected if The device is a Mitel 6873i, 6930, or 6940 SIP phone
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Check the installed firmware versionLog into the phone's web administrative interface and navigate to Status or System Information page to view the firmware version; alternatively, access the device directly and check the firmware information in the settingsAffected if The firmware version is < 5.1.0 or exactly 5.1.0
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Verify if Bluetooth is enabledAccess the phone's web interface and check the Bluetooth settings page (under Hardware or Peripheral settings) to determine if Bluetooth functionality is turned onAffected if Bluetooth is enabled on the device
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Confirm Bluetooth handset pairing capabilityCheck the phone's settings to verify that Bluetooth handset or headset pairing is configured or available; the vulnerability exploits the pairing process when the handset loses connectionAffected if Bluetooth handset/headset pairing is available or configured
The device is affected if it is a Mitel 6873i, 6930, or 6940 SIP phone with firmware version 5.1.0 or lower, and Bluetooth is enabled with handset pairing functionality available.
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.
From vendor data5.1.0
Upgrade Mitel MiVoice 6873i, 6930, and 6940 SIP phone firmware to version 5.1.0.SP6 or later to remediate the improper Bluetooth pairing vulnerability.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27639 — 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-2020-27639 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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