The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade krb5 | Aug 30, 2017 | Nov 8, 2015 |
| Debian | — | Upgrade krb5 | Jul 30, 2024 | May 25, 2015 |
| Freebsd | — | Upgrade krb5-112Upgrade krb5 | Dec 10, 2025 | May 28, 2015 |
| Oracle_linux | — | Upgrade krb5-pkinitUpgrade krb5-serverUpgrade krb5-libsUpgrade krb5-develUpgrade krb5-server-ldapUpgrade krb5-workstation | Oct 16, 2024 | May 25, 2015 |
| Suse | — | Upgrade krb5Upgrade krb5-clientUpgrade krb5-docUpgrade krb5-plugin-preauth-pkinitUpgrade krb5-plugin-preauth-otpUpgrade krb5-32bitUpgrade krb5-plugin-kdb-ldapUpgrade krb5-develUpgrade krb5-server | Dec 18, 2015 | May 25, 2015 |
| Ubuntu | — | Upgrade krb5-k5tlsUpgrade libkrb53Upgrade libkdb5-7Upgrade libkadm5clnt-mit9Upgrade libkrb5support0Upgrade libgssrpc4Upgrade krb5-userUpgrade libkadm5clnt-mit8Upgrade krb5-admin-serverUpgrade krb5-kdc-ldapUpgrade libkdb5-6Upgrade libk5crypto3Upgrade libkrb5-3Upgrade krb5-pkinitUpgrade libkdb5-8Upgrade libkrad0Upgrade krb5-kdcUpgrade libgssapi-krb5-2Upgrade krb5-otp | Nov 16, 2015 | May 25, 2015 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub