How severe is CVE-2000-0547?

CVE-2000-0547 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2000-0547 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0547?

CVE-2000-0547 primarily affects Cygnus Network Security Project Cygnus Network Security. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-0547?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2000-0547 published?

CVE-2000-0547 was published on 2000-06-09 and last updated on 2026-06-16.

CVE-2000-0547

CVE-2000-0547 is a medium-severity vulnerability in Cygnus Network Security Project Cygnus Network Security with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Cygnus Network Security Project Cygnus Network Security
Published: 2000-06-09
Last modified: 2026-06-16

Description

Buffer overflow in Kerberos 4 KDC program allows remote attackers to cause a denial of service via the localrealm variable in the process_v4 function.

Frequently asked questions

What is CVE-2000-0547?: Buffer overflow in Kerberos 4 KDC program allows remote attackers to cause a denial of service via the localrealm variable in the process_v4 function.
How severe is CVE-2000-0547?: CVE-2000-0547 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2000-0547 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0547?: CVE-2000-0547 primarily affects Cygnus Network Security Project Cygnus Network Security. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-0547?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2000-0547 published?: CVE-2000-0547 was published on 2000-06-09 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:cygnus_network_security_project:cygnus_network_security:-:*:*:*:*:*:*:*
cpe:2.3:a:kerbnet_project:kerbnet:-:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos:4.0:-:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos:4.0:patch10:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.1.1:*:*:*:*:*:*:*

More vulnerabilities in Cygnus Network Security Project Cygnus Network Security

CVE-2000-0548 — Medium (CVSS 5.0): Buffer overflow in Kerberos 4 KDC program allows remote attackers to cause a denial of service via the e_msg variable…
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