CVE-2019-3818: The kube-rbac-proxy container before version 0.4.1 as used in Red Hat OpenShift Container Platform does not ho

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEDOWNGRADE

CVE-2019-3818 is a high-severity flaw (CVSS 7.5) affecting kube-rbac-proxy, openshift container platform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The kube-rbac-proxy container before version 0.4.1 as used in Red Hat OpenShift Container Platform does not honor TLS configurations, allowing for use of insecure ciphers and TLS 1.0. An attacker could target traffic sent over a TLS connection with a weak configuration and potentially break the encryption.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-327
Published	2019-02-05
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: kube-rbac-proxy project · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-02-05 17:29 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

kube-rbac-proxy project kube-rbac-proxy UPGRADE

Affected: < 0.4.1

Fixed in: 0.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kube-rbac-proxy || rpm -q kube-rbac-proxy || kube-rbac-proxy --version

2. UPGRADE to 0.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kube-rbac-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kube-rbac-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat openshift container platform DOWNGRADE

Affected: 3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.11

1. Check installed version

apt-cache policy openshift-container-platform || rpm -q openshift-container-platform || openshift-container-platform --version

2. No fixed release: DOWNGRADE to a release before 3.11 (Debian / Ubuntu)

apt-cache madison openshift-container-platform sudo apt install openshift-container-platform=<VERSION_BEFORE_3.11> sudo apt-mark hold openshift-container-platform

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openshift-container-platform sudo dnf downgrade openshift-container-platform-<VERSION_BEFORE_3.11> sudo dnf versionlock add openshift-container-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-3818?

kube-rbac-proxy: upgrade to 0.4.1; openshift container platform: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-3818 being exploited?

CVE-2019-3818 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-3818 affect?

CVE-2019-3818 affects kube-rbac-proxy, openshift container platform. Severity is high (CVSS 7.5). The kube-rbac-proxy container before version 0.4.1 as used in Red Hat OpenShift Container Platform does not honor TLS configurations, allowing for use of insecure ciphers and TLS 1.0. An attacker could target traffic sent over a TLS connect

How urgent is CVE-2019-3818?

Priority 49/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Red Hat OpenShift vulnerabilities

References

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