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CVE-2019-14820: It was found that keycloak before version 8.0.0 exposes internal adapter endpoints in org.keycloak.constants.A

33
Routine
MEDIUM 4.3WATCHLISTUPGRADEDOWNGRADEDOWNGRADE

CVE-2019-14820 is a medium-severity flaw (CVSS 4.3) affecting keycloak, single sign-on, jboss enterprise application platform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

It was found that keycloak before version 8.0.0 exposes internal adapter endpoints in org.keycloak.constants.AdapterConstants, which can be invoked via a specially-crafted URL. This vulnerability could allow an attacker to access unauthorized information.

Why this priority

  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score4.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.7% (top 46%)
CISA exploited listNo
WeaknessCWE-200
Published2020-01-08
Last modified2026-06-17
Publisher (CNA): Red Hat, Inc. · Vendor: redhat

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

Am I affected?

Timeline

redhat keycloak UPGRADE
Affected: < 8.0.0
Fixed in: 8.0.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy keycloak || rpm -q keycloak || keycloak --version
2. UPGRADE to 8.0.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade keycloak
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade keycloak
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat single sign-on DOWNGRADE
Affected: 7.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.3
1. Check installed version
apt-cache policy single-sign-on || rpm -q single-sign-on || single-sign-on --version
2. No fixed release: DOWNGRADE to a release before 7.3 (Debian / Ubuntu)
apt-cache madison single-sign-on sudo apt install single-sign-on=<VERSION_BEFORE_7.3> sudo apt-mark hold single-sign-on
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list single-sign-on sudo dnf downgrade single-sign-on-<VERSION_BEFORE_7.3> sudo dnf versionlock add single-sign-on
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.
redhat jboss enterprise application platform DOWNGRADE
Affected: 6.4.0 · 7.2.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.4.0
1. Check installed version
apt-cache policy jboss-enterprise-application-platform || rpm -q jboss-enterprise-application-platform || jboss-enterprise-application-platform --version
2. No fixed release: DOWNGRADE to a release before 6.4.0 (Debian / Ubuntu)
apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_6.4.0> sudo apt-mark hold jboss-enterprise-application-platform
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jboss-enterprise-application-platform sudo dnf downgrade jboss-enterprise-application-platform-<VERSION_BEFORE_6.4.0> sudo dnf versionlock add jboss-enterprise-application-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.
redhat jboss fuse DOWNGRADE
Affected: 7.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0.0
1. Check installed version
apt-cache policy jboss-fuse || rpm -q jboss-fuse || jboss-fuse --version
2. No fixed release: DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)
apt-cache madison jboss-fuse sudo apt install jboss-fuse=<VERSION_BEFORE_7.0.0> sudo apt-mark hold jboss-fuse
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jboss-fuse sudo dnf downgrade jboss-fuse-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add jboss-fuse
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-2019-14820?

keycloak: upgrade to 8.0.0; single sign-on: downgrade or apply the listed mitigation; jboss enterprise application platform: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-14820 being exploited?

CVE-2019-14820 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-2019-14820 affect?

CVE-2019-14820 affects keycloak, single sign-on, jboss enterprise application platform. Severity is medium (CVSS 4.3). It was found that keycloak before version 8.0.0 exposes internal adapter endpoints in org.keycloak.constants.AdapterConstants, which can be invoked via a specially-crafted URL. This vulnerability could allow an attacker to access unauthoriz

How urgent is CVE-2019-14820?

Priority 33/100. On your watchlist

Software pages

Keycloak vulnerabilities · JBoss and WildFly vulnerabilities

Related CVEs

References

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