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Vulnerability record · CVE-2000-0549 · published 9 June 2000

CVE-2000-0549: Cygnus network security vulnerability

Cygnus · Cygnus Network Security

Kerberos 4 KDC program does not properly check for null termination of AUTH_MSG_KDC_REQUEST requests, which allows remote attackers to cause a denial of service via a malformed request.

5.0 CVSS 2.0 Medium EPSS 2.3% · top 17.4%
5.0CVSS 2.0 base score
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
10References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

Kerberos 4 KDC program does not properly check for null termination of AUTH_MSG_KDC_REQUEST requests, which allows remote attackers to cause a denial of service via a malformed request.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html ExploitPatchVendor Advisory
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 PatchThird Party AdvisoryUS Government Resource
http://www.redhat.com/support/errata/RHSA-2000-031.html
http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html ExploitPatchVendor Advisory
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 PatchThird Party AdvisoryUS Government Resource
http://www.redhat.com/support/errata/RHSA-2000-031.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2000-0549), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.