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High RHSA-2021:3528 5 CVEs

Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 7

Published Sep 29, 2024 · Updated Aug 14, 2026

Ecosystem: Red Hat

Fixed packages 2

ReleasePackageFixed in
Red Hat · Red Hat Single Sign On 7 red_hat_single_sign_on:7::el7 rh-sso7-keycloak 0:9.0.15-1.redhat_00002.1.el7sso
Red Hat · Red Hat Single Sign On 7 red_hat_single_sign_on:7::el7 rh-sso7-keycloak-server 0:9.0.15-1.redhat_00002.1.el7sso

Vulnerabilities 5

  • High 7.5
    CVE-2020-28491

    Denial of Service (DoS)

    This affects the package com.fasterxml.jackson.dataformat:jackson-dataformat-cbor from 0 and before 2.11.4, from 2.12.0-rc1 and before 2.12.1. Unchecked allocation of byte buffer can cause a java.lang.OutOfMemoryError exception.

    jackson-dataformat-cbor jackson-dataformat-cbor com.fasterxml.jackson.dataformat:jackson-dataformat-cbor Debian Ubuntu Maven
  • High 7.5
    CVE-2021-3513

    Incorrect implementation of lockout feature in Keycloak

    A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confide…

    org.keycloak:keycloak-parent Maven
  • High 7.5
    CVE-2021-3632

    Keycloak allows anyone to register new security device or key for any user by using WebAuthn password-less login flow

    A flaw was found in Keycloak. This vulnerability allows anyone to register a new security device or key when there is not a device already registered for any user by using the WebAuthn password-less login flow.

    org.keycloak:keycloak-core Maven
  • High 7.5
    CVE-2021-3637

    Allocation of resources without limits or throttling in keycloak-model-infinispan

    A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.

    org.keycloak:keycloak-model-infinispan Maven
  • Medium 5.4
    CVE-2020-35509

    Keycloak vulnerable to Improper Certificate Validation

    A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and …

    org.keycloak:keycloak-core Maven

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1978196
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1979638
  • article
    https://access.redhat.com/security/updates/classification/#moderate
  • article
    https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.4/html/release_notes/index
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1912427
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1953439
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1930423
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3528.json
  • report
    https://access.redhat.com/security/cve/CVE-2020-28491
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2020-28491
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2020-28491
  • article
    https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONDATAFORMAT-1047329
  • report
    https://access.redhat.com/security/cve/CVE-2020-35509
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2020-35509
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2020-35509
  • report
    https://access.redhat.com/security/cve/CVE-2021-3513
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3513
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3513
  • report
    https://access.redhat.com/security/cve/CVE-2021-3632
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3632
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3632
  • report
    https://access.redhat.com/security/cve/CVE-2021-3637
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3637
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3637