CVE-2021-3176

Name: CVE-2021-3176
Creator: NVD / NIST
Published: 2021-01-29T07:15:18.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 0.88%

Last modified Jun 17, 2026

CVE-2021-3176 is a high-severity vulnerability rated 8/10 on the CVSS scale. The chat window of the Mitel BusinessCTI Enterprise (MBC-E) Client for Windows before 6.4.15 and 7.x before 7.1.2 could allow an attacker to gain access to user information by sending certain code, due to improper input validation of http links. A successful exploit could allow an attacker to view user information and application data.. EPSS estimates a 0.88% chance of exploitation in the next 30 days.

Description

The chat window of the Mitel BusinessCTI Enterprise (MBC-E) Client for Windows before 6.4.15 and 7.x before 7.1.2 could allow an attacker to gain access to user information by sending certain code, due to improper input validation of http links. A successful exploit could allow an attacker to view user information and application data.

Metrics

CVSS 3.1

8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.88%

54.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mitel	Businesscti Enterprise	< 6.4.15
Mitel	Businesscti Enterprise	>= 7.0, < 7.1.2

References

https://www.mitel.com/support/security-advisoriesVendor Advisory
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-21-0001Vendor Advisory
https://www.mitel.com/support/security-advisoriesVendor Advisory
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-21-0001Vendor Advisory

Timeline

Published: Jan 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3176?

How severe is CVE-2021-3176?

CVE-2021-3176 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 0.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3176?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3176?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST