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krb5: unbounded recursion via an ASN.1-encoded Kerberos message in lib/krb5/asn.1/asn1_encode.c may lead to DoS

🗓️ 18 May 2021 14:23:41Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

Kerberos 5 denial of service from unbounded recursion in ASN.1 messages due to BER indefinite lengths.

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Tenable Nessus		Amazon Linux 2 : krb5 (ALAS-2022-1845)
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Tenable Nessus		AlmaLinux 8 : krb5 (ALSA-2021:1593)
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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8aarch64krb5-debuginfo1.18.2-8.el8krb5-debuginfo-1.18.2-8.el8.aarch64.rpm
Red Hat Enterprise Linux8i686krb5-debuginfo1.18.2-8.el8krb5-debuginfo-1.18.2-8.el8.i686.rpm
Red Hat Enterprise Linux8ppc64lekrb5-debuginfo1.18.2-8.el8krb5-debuginfo-1.18.2-8.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xkrb5-debuginfo1.18.2-8.el8krb5-debuginfo-1.18.2-8.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64krb5-debuginfo1.18.2-8.el8krb5-debuginfo-1.18.2-8.el8.x86_64.rpm
Red Hat Enterprise Linux8aarch64krb5-debugsource1.18.2-8.el8krb5-debugsource-1.18.2-8.el8.aarch64.rpm
Red Hat Enterprise Linux8i686krb5-debugsource1.18.2-8.el8krb5-debugsource-1.18.2-8.el8.i686.rpm
Red Hat Enterprise Linux8ppc64lekrb5-debugsource1.18.2-8.el8krb5-debugsource-1.18.2-8.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xkrb5-debugsource1.18.2-8.el8krb5-debugsource-1.18.2-8.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64krb5-debugsource1.18.2-8.el8krb5-debugsource-1.18.2-8.el8.x86_64.rpm
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28 Jun 2026 12:34Current
7.1High risk
Vulners AI Score7.1
CVSS 25
CVSS 3.17.5
EPSS0.04365
SSVC
CWE-674
kerberosrecursionindefinite lengthsdenial of service
3