What is CVE-2021-4047?

CVE-2021-4047 is a high-severity vulnerability in Red Hat Openshift, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-04-11.

How severe is CVE-2021-4047?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Red Hat Openshift

CVE-2021-4047

The release of OpenShift 4.9.6 included four CVE fixes for the haproxy package, however the patch for CVE-2021-39242 was missing. This issue only affects Red Hat OpenShift 4.9.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Red Hat Openshift — versions 4.9
Openshift — versions OpenShift 4.9

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

bugzilla.redhat.com/show_bug.cgi (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-4047?: CVE-2021-4047 is a high-severity vulnerability in Red Hat Openshift, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-04-11.
How severe is CVE-2021-4047?: High severity. CVSS v3 base score is 7.5 out of 10.