What’s Vulnerable › Vulnerabilities

CVE-2000-0546

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2000-06-09 · updated 2026-06-16
• Weakness: CWE-120

Description

Buffer overflow in Kerberos 4 KDC program allows remote attackers to cause a denial of service via the lastrealm variable in the set_tgtkey function.

Affected products

• Cygnus Network Security Project Cygnus Network Security: all versions
• Kerbnet Project Kerbnet: all versions
• MIT Kerberos: before 4.0; 4.0, 4.0-patch10 — fixed in 4.0
• MIT Kerberos 5: from 1.0 through 1.0.7; 1.1, 1.1.1

How to fix

Upgrade to a fixed version: MIT Kerberos 4.0. Check the vendor advisory for mitigations.

References

• http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html
• http://ciac.llnl.gov/ciac/bulletins/k-051.shtml
• http://web.mit.edu/kerberos/www/advisories/krb4kdc.txt
• http://www.cert.org/advisories/CA-2000-11.html
• http://www.securityfocus.com/bid/1338
• http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html
• http://ciac.llnl.gov/ciac/bulletins/k-051.shtml
• http://web.mit.edu/kerberos/www/advisories/krb4kdc.txt
• http://www.cert.org/advisories/CA-2000-11.html
• http://www.securityfocus.com/bid/1338

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