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CVE-2023-1664: A flaw was found in Keycloak

42
This month
MEDIUM 6.5REMOTEWATCHLISTMITIGATEDOWNGRADEMITIGATE

CVE-2023-1664 is a medium-severity flaw (CVSS 6.5) affecting build of quarkus, jboss a-mq, keycloak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Keycloak. This flaw depends on a non-default configuration "Revalidate Client Certificate" to be enabled and the reverse proxy is not validating the certificate before Keycloak. Using this method an attacker may choose the certificate which will be validated by the server. If this happens and the KC_SPI_TRUSTSTORE_FILE_FILE variable is missing/misconfigured, any trustfile may be accepted with the logging information of "Cannot

Why this priority

  • Remotely exploitable, no login, no user action
  • On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 63%)
CISA exploited listNo
WeaknessCWE-295
Published2023-05-26
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 build of quarkus MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy build-of-quarkus || rpm -q build-of-quarkus || build-of-quarkus --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat jboss a-mq DOWNGRADE
Affected: 7
Fixed in: no fixed release known
Safe to downgrade to: a release before 7
1. Check installed version
apt-cache policy jboss-a-mq || rpm -q jboss-a-mq || jboss-a-mq --version
2. No fixed release: DOWNGRADE to a release before 7 (Debian / Ubuntu)
apt-cache madison jboss-a-mq sudo apt install jboss-a-mq=<VERSION_BEFORE_7> sudo apt-mark hold jboss-a-mq
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jboss-a-mq sudo dnf downgrade jboss-a-mq-<VERSION_BEFORE_7> sudo dnf versionlock add jboss-a-mq
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 keycloak MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy keycloak || rpm -q keycloak || keycloak --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat migration toolkit for runtimes MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy migration-toolkit-for-runtimes || rpm -q migration-toolkit-for-runtimes || migration-toolkit-for-runtimes --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat single sign-on DOWNGRADE
Affected: 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
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 7.0 (Debian / Ubuntu)
apt-cache madison single-sign-on sudo apt install single-sign-on=<VERSION_BEFORE_7.0> 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_7.0> 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.
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-2023-1664?

build of quarkus: mitigate or apply the listed mitigation; jboss a-mq: downgrade or apply the listed mitigation; keycloak: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-1664 being exploited?

CVE-2023-1664 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-2023-1664 affect?

CVE-2023-1664 affects build of quarkus, jboss a-mq, keycloak. Severity is medium (CVSS 6.5). A flaw was found in Keycloak. This flaw depends on a non-default configuration "Revalidate Client Certificate" to be enabled and the reverse proxy is not validating the certificate before Keycloak. Using this method an attacker may choose t

How urgent is CVE-2023-1664?

Priority 42/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Keycloak vulnerabilities · JBoss and WildFly vulnerabilities

Related CVEs

References

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