How severe is CVE-2021-45490?

CVE-2021-45490 has a CVSS 3.x base score of 9.1, 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 none.

Is CVE-2021-45490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45490?

CVE-2021-45490 primarily affects 3cx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45490?

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-2021-45490 published?

CVE-2021-45490 was published on 2022-03-28 and last updated on 2026-06-17.

CVE-2021-45490

CVE-2021-45490 is a critical-severity vulnerability in 3cx with a CVSS 3.x base score of 9.1. 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-295.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: 3cx
Published: 2022-03-28
Last modified: 2026-06-17

Description

The client applications in 3CX on Windows, the 3CX app for iOS, and the 3CX application for Android through 2022-03-17 lack SSL certificate validation.

Frequently asked questions

What is CVE-2021-45490?: The client applications in 3CX on Windows, the 3CX app for iOS, and the 3CX application for Android through 2022-03-17 lack SSL certificate validation.
How severe is CVE-2021-45490?: CVE-2021-45490 has a CVSS 3.x base score of 9.1, 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 none.
Is CVE-2021-45490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45490?: CVE-2021-45490 primarily affects 3cx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45490?: 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-2021-45490 published?: CVE-2021-45490 was published on 2022-03-28 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:3cx:3cx:*:*:*:*:*:iphone_os:*:*
cpe:2.3:a:3cx:3cx:*:*:*:*:*:android:*:*
cpe:2.3:a:3cx:3cx:*:*:*:*:legacy:windows:*:*

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