CVE-2019-19891
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 · uneditedAn encryption key vulnerability on Mitel SIP-DECT wireless devices 8.0 and 8.1 could allow an attacker to launch a man-in-the-middle attack. A successful exploit may allow the attacker to intercept sensitive information.
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 · moderate confidenceA weak or predictable encryption key vulnerability in Mitel SIP-DECT wireless devices versions 8.0 and 8.1 allows an attacker positioned on the network to perform man-in-the-middle attacks, potentially intercepting sensitive voice and signaling communications transmitted over the DECT wireless link.
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= 8.0= 8.1CVSS 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
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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 device modelLocate the physical Mitel device or check network inventory for Mitel SIP-DECT wireless hardware (e.g., base stations, handsets)Affected if The device is not a Mitel SIP-DECT device - this CVE does not apply
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Check the installed firmware versionAccess the device management interface or use SNMP/CLI to query the firmware version. Common commands: 'show version' or check the web UI under Status or System InformationAffected if The firmware version is exactly 8.0 or 8.1 - these are the only affected versions per this CVE
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Confirm DECT wireless functionality is activeVerify the device has DECT radio enabled and is actively transmitting over DECT. Check wireless status in the management interface or monitor for DECT-spectrum emissionsAffected if DECT wireless is not enabled or the device is wired-only - the vulnerability requires the DECT wireless link to be exploitable
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Inspect encryption configurationCheck the device security or encryption settings in the management interface. Look for encryption key configuration, cipher settings, or key generation methodsAffected if Weak, default, or predictable encryption keys are configured - the vulnerability specifically involves weak/predictable keys enabling MITM attacks
The environment is affected only if Mitel SIP-DECT devices are running exactly firmware version 8.0 or 8.1 AND DECT wireless is enabled, with weak encryption keys in use.
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 dataUpdate Mitel SIP-DECT devices to a patched firmware version and regenerate all encryption keys to remediate this 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-2019-19891 — 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-2019-19891 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data