RLSA-2021:1593

    Dashboard / Vulnerabilities / RLSA-2021:1593

    RLSA-2021:1593

    Published: 18 May 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-28196

    Summary: Moderate: krb5 security update

    Details: Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC). Security Fix(es): * krb5: unbounded recursion via an ASN.1-encoded Kerberos message in lib/krb5/asn.1/asn1_encode.c may lead to DoS (CVE-2020-28196) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.

    References: https://errata.rockylinux.org/RLSA-2021:1593, https://bugzilla.redhat.com/show_bug.cgi?id=1835713, https://bugzilla.redhat.com/show_bug.cgi?id=1868039, https://bugzilla.redhat.com/show_bug.cgi?id=1869055, https://bugzilla.redhat.com/show_bug.cgi?id=1872689, https://bugzilla.redhat.com/show_bug.cgi?id=1901041

    Affected packages

    Package

    Name: krb5

    Purl: pkg:rpm/rocky-linux/krb5?distro=rocky-linux-8-4-legacy&epoch=0

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0:1.18.2-8.el8

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    RLSA-2021:1593 | CVE-DB