How severe is CVE-2020-27640?

CVE-2020-27640 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2020-27640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27640?

CVE-2020-27640 primarily affects Mitel Mivoice 6940 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-27640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-27640 published?

CVE-2020-27640 was published on 2020-12-18 and last updated on 2026-06-17.

CVE-2020-27640

CVE-2020-27640 is a high-severity vulnerability in Mitel Mivoice 6940 Firmware with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 4.8
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mitel Mivoice 6940 Firmware
Published: 2020-12-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-27640?: 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.
How severe is CVE-2020-27640?: CVE-2020-27640 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2020-27640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27640?: CVE-2020-27640 primarily affects Mitel Mivoice 6940 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-27640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-27640 published?: CVE-2020-27640 was published on 2020-12-18 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:o:mitel:mivoice_6940_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:mivoice_6930_firmware:*:*:*:*:*:*:*:*