Vulnerability Monitor

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CVE-2000-0550

Kerberos 4 KDC program improperly frees memory twice (aka "double-free"), which allows remote attackers to cause a denial of service.

Security Impact Summary

CVE-2000-0550 is a security vulnerability that . Impacting 4 products from cygnus, from cygnus, from mit and 1 other, organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2000, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2000-06-09T04:00:00.000

Last Modified

2025-04-03T01:03:51.193

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cygnus	cygnus_network_security	4.0	Yes
Application	cygnus	kerbnet	5.0	Yes
Application	mit	kerberos	4.0	Yes
Application	mit	kerberos_5	1.0	Yes
Application	mit	kerberos_5	1.1	Yes
Application	mit	kerberos_5	1.1.1	Yes

References

http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html ([email protected])
http://ciac.llnl.gov/ciac/bulletins/k-051.shtml ([email protected])
http://web.mit.edu/kerberos/www/advisories/krb4kdc.txt ([email protected])
http://www.cert.org/advisories/CA-2000-11.html Patch, Third Party Advisory, US Government Resource ([email protected])
http://www.redhat.com/support/errata/RHSA-2000-031.html ([email protected])
http://www.securityfocus.com/bid/1465 ([email protected])
http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html (af854a3a-2127-422b-91ae-364da2661108)
http://ciac.llnl.gov/ciac/bulletins/k-051.shtml (af854a3a-2127-422b-91ae-364da2661108)
http://web.mit.edu/kerberos/www/advisories/krb4kdc.txt (af854a3a-2127-422b-91ae-364da2661108)
http://www.cert.org/advisories/CA-2000-11.html Patch, Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
http://www.redhat.com/support/errata/RHSA-2000-031.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/1465 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cygnus's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.