Security readout for executives and security teams
A flaw in the Kerberos 4 Key Distribution Center (KDC) lets a remote attacker crash the authentication service by sending a malformed request. Because Kerberos issues the tickets users need to log into networked services, an outage of the KDC can effectively lock legitimate users out of applications that depend on it. Exposure is limited to environments still running Kerberos 4 KDC code paths, primarily legacy MIT Kerberos or vendor rebuilds from 2000. Modern deployments have migrated to Kerberos 5, so most current enterprises are not exposed unless legacy authentication realms remain in service. Low to moderate priority for most organizations today, and only elevated if legacy Kerberos 4 authentication is still in production. Treat as a hygiene and legacy-retirement item rather than an emergency, but resolve promptly where identified to avoid authentication outages. Mitigation focus: Apply the MIT Kerberos 4 KDC patch referenced in the MIT krb4kdc advisory.; Install vendor updates such as Red Hat RHSA-2000:031 on affected hosts.; Retire Kerberos 4 and migrate remaining realms to Kerberos 5 where feasible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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CVE-2000-0549 mapping review
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Open ATT&CK lookup- Severity
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- CVSS
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- Known Exploited
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- Published
CNA and ADP enrichment extracted from CVE v5
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Source materials
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