HOMEVULNERABILITIESCVE-2020-27640
HIGH

CVE-2020-27640

NVD-CWE-noinfoPublished: December 18, 2020· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official Description

The Bluetooth handset of Mitel MiVoice 6940 and 6930 MiNet phones with firmware before 1.5.3 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.

NVD Source

Technical Analysis

CVE-2020-27640 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

mitel4 product(s)
mivoice 6940 firmwaremivoice 6940mivoice 6930 firmwaremivoice 6930
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://www.mitel.com/support/security-advisories
ADVISORYhttps://www.mitel.com/support/security-advisories

All References (2)

→
https://www.mitel.com/support/security-advisoriesVendor Advisory
→
https://www.mitel.com/support/security-advisoriesVendor Advisory

Quick Facts

CVE IDCVE-2020-27640
CVSS Score8.1 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedDec 18, 2020

Related CVEs (NVD-CWE-noinfo)

CVE-2022-21389
10.0
CVE-2022-21390
10.0
CVE-2021-35652
10.0
CVE-2021-41873
10.0
CVE-2022-21275
10.0
CVE-2022-32845
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27640 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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