# CVE-2020-28196: krb5-devel: Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecu... CVE-2020-28196 is fixed in 26 products on 1 platform, first by krb5-admin-server 1.16-2ubuntu0.2, released November 6, 2020. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2020-28196 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0442 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 6, 2020 ## Description 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 Red Hat Enterprise Linux 8.4 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | krb5-admin-server Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-admin-server 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-admin-server-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-admin-server Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-admin-server 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-admin-server-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-devel RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-devel ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | krb5-gss-samples Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-gss-samples 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-gss-samples-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-gss-samples Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-gss-samples 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-gss-samples-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-k5tls Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-k5tls 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-k5tls-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-k5tls Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-k5tls 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-k5tls-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-kdc Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-kdc 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-kdc-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-kdc Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-kdc 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-kdc-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-kdc-ldap Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-kdc-ldap 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-kdc-ldap-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-kdc-ldap Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-kdc-ldap 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-kdc-ldap-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-kpropd Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-kpropd 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-kpropd-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-kpropd Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-kpropd 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-kpropd-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-libs RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-libs ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | krb5-locales Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-locales 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-locales-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-locales Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-locales 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-locales-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-multidev Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-multidev 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-multidev-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-multidev Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-multidev 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-multidev-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-otp Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-otp 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-otp-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-otp Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-otp 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-otp-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-pkinit RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-pkinit Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-pkinit 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-pkinit-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-pkinit Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-pkinit 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-pkinit-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-pkinit ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | krb5-server RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-server ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | krb5-server-ldap RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-server-ldap ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | krb5-user Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [krb5-user 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-krb5-user-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | krb5-user Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [krb5-user 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-krb5-user-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | krb5-workstation RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | krb5-workstation ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | libgssapi-krb5-2 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libgssapi-krb5-2 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libgssapi-krb5-2-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libgssapi-krb5-2 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libgssapi-krb5-2 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libgssapi-krb5-2-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libgssrpc4 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libgssrpc4 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libgssrpc4-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libgssrpc4 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libgssrpc4 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libgssrpc4-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libk5crypto3 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libk5crypto3 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libk5crypto3-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libk5crypto3 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libk5crypto3 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libk5crypto3-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkadm5 RHEL 8 | 0:1.18.2-8.el8 | [RHSA-2021:1593](https://patchblox.com/security/data/fix/linux/rhsa-2021-1593.md) | May 18, 2021 | | Linux | libkadm5 ol 8 | 0:1.18.2-8.el8 | [ELSA-2021-1593](https://patchblox.com/security/data/fix/linux/elsa-2021-1593.md) | May 25, 2021 | | Linux | libkadm5clnt-mit11 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkadm5clnt-mit11 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkadm5clnt-mit11-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkadm5clnt-mit11 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkadm5clnt-mit11 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkadm5clnt-mit11-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkadm5srv-mit11 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkadm5srv-mit11 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkadm5srv-mit11-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkadm5srv-mit11 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkadm5srv-mit11 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkadm5srv-mit11-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkdb5-9 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkdb5-9 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkdb5-9-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkdb5-9 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkdb5-9 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkdb5-9-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkrad0 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkrad0 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkrad0-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkrad0 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkrad0 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkrad0-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkrb5-3 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkrb5-3 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkrb5-3-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkrb5-3 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkrb5-3 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkrb5-3-1.17-6ubuntu4.1.md) | Nov 6, 2020 | | Linux | libkrb5support0 Ubuntu 18.04.6 LTS (bionic) | 1.16-2ubuntu0.2 | [libkrb5support0 1.16-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libkrb5support0-1.16-2ubuntu0.2.md) | Nov 6, 2020 | | Linux | libkrb5support0 Ubuntu 20.04 LTS (focal) | 1.17-6ubuntu4.1 | [libkrb5support0 1.17-6ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libkrb5support0-1.17-6ubuntu4.1.md) | Nov 6, 2020 | --- Data as of 2026-11-08T00:53:09Z UTC. 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