How severe is CVE-2020-10377?

CVE-2020-10377 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-10377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-10377?

CVE-2020-10377 affects Mitel Mivoice Connect Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-10377?

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

When was CVE-2020-10377 published?

CVE-2020-10377 was published on 2020-04-17 and last updated on 2026-06-17.

CVE-2020-10377

CVE-2020-10377 is a critical-severity vulnerability in Mitel Mivoice Connect Client with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Mitel Mivoice Connect Client
Published: 2020-04-17
Last modified: 2026-06-17

Description

A weak encryption vulnerability in Mitel MiVoice Connect Client before 214.100.1214.0 could allow an unauthenticated attacker to gain access to user credentials. A successful exploit could allow an attacker to access the system with compromised user credentials.

Frequently asked questions

What is CVE-2020-10377?: A weak encryption vulnerability in Mitel MiVoice Connect Client before 214.100.1214.0 could allow an unauthenticated attacker to gain access to user credentials. A successful exploit could allow an attacker to access the system with compromised user credentials.
How severe is CVE-2020-10377?: CVE-2020-10377 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-10377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-10377?: CVE-2020-10377 affects Mitel Mivoice Connect Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-10377?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-10377 published?: CVE-2020-10377 was published on 2020-04-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mitel:mivoice_connect_client:*:*:*:*:*:*:*:*

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