CVE-2021-4047
The release of OpenShift 4.9.6 included four CVE fixes for the haproxy package, however the patch...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-4047- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-4047- Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2021-33944 No score
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.
- Record
EUVD-2021-33944- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v3g6-gh83-x752
The release of OpenShift 4.9.6 included four CVE fixes for the haproxy package, however the patch...
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.
- Record
GHSA-v3g6-gh83-x752- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
OSVRHSA-2021:5002
Red Hat Security Advisory: OpenShift Container Platform 4.9.11 security update
- Record
RHSA-2021:5002- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
haproxyRed Hat:openshift:4.9::el8 |
before 0:2.2.15-3.el8 | 0:2.2.15-3.el8 |
haproxy-debugsourceRed Hat:openshift:4.9::el8 |
before 0:2.2.15-3.el8 | 0:2.2.15-3.el8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-4047 is a high vulnerability (CVSS 7.5) in Redhat Openshift, published April 11, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.93%, the 61st percentile. Fixed in haproxy 0:2.2.15-3.el8.
References
bugzilla.redhat.com/show_bug.cgi?id=2027881
nvd.nist.gov/vuln/detail/CVE-2021-4047
access.redhat.com/errata/RHSA-2021:5002
github.com/advisories/GHSA-v3g6-gh83-x752
security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_5002.json
cve.org/CVERecord?id=CVE-2021-4047