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Fencer Intel
high 7.5

CVE-2021-4047 json

The release of OpenShift 4.9.6 included four CVE fixes for the haproxy package, however the patch for CVE-2021-39242 was missing.

published 4y ago modified 4mo ago also EUVD-2021-33944

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

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.

Patch / fix

  • haproxy openshift 4.9 2.2.15-3.el8

red hat advisories RHSA-2021:5002

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4047 updated cvss 7.5

haproxy: Incomplete fix for CVE-2021-39242 in OpenShift 4.9

  • Red Hat OpenShift Container Platform 4.9 haproxy 2.2.15-3.el8
    fixed: vendor fix RHSA-2021:5002
  • Red Hat Enterprise Linux 7 haproxy Red Hat Enterprise Linux 8 haproxy Red Hat Enterprise Linux 9 haproxy Red Hat OpenShift Container Platform 3.11 haproxy, haproxy18 Red Hat OpenShift Container Platform 4.9 cri-o 1.22.1-8.rhaos4.9.gite059965.el8 Red Hat Software Collections rh-haproxy18-haproxy, rh-haproxy18-haproxy-syspaths
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • n/a OpenShift

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.