What is CVE-2021-45491?

CVE-2021-45491 is a medium-severity vulnerability in 3cx, classified under Cleartext Storage of Sensitive Information. CVSS score: 6.5/10. Published 2022-03-28.

How severe is CVE-2021-45491?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in 3cx

CVE-2021-45491

3CX System through 2022-03-17 stores cleartext passwords in a database.

Published 2022-03-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

www.3cx.com/community/forums/posts-articles-news/ (Vendor Advisory)
packetstormsecurity.com/files/166386/3CX-Phone-System-Cleartext-Passwords.html (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45491?: CVE-2021-45491 is a medium-severity vulnerability in 3cx, classified under Cleartext Storage of Sensitive Information. CVSS score: 6.5/10. Published 2022-03-28.
How severe is CVE-2021-45491?: Medium severity. CVSS v3 base score is 6.5 out of 10.