What is CVE-2021-42776?

CVE-2021-42776 is a high-severity vulnerability in Cloverdx, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.7/10. Published 2021-12-01.

How severe is CVE-2021-42776?

High severity. CVSS v3 base score is 7.7 out of 10.

XXE in Cloverdx

CVE-2021-42776

CloverDX Server before 5.11.2 and and 5.12.x before 5.12.1 allows XXE during configuration import.

Vulnerability class: XXE (XML External Entity)

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.0th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% 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

Cloverdx — versions 5.12.0, 5.12.1

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

support.cloverdx.com/releases/ (Release Notes, Vendor Advisory)
support1.cloverdx.com/hc/en-us/articles/4411125429010 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-42776?: CVE-2021-42776 is a high-severity vulnerability in Cloverdx, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.7/10. Published 2021-12-01.
How severe is CVE-2021-42776?: High severity. CVSS v3 base score is 7.7 out of 10.