How severe is CVE-2006-6143?

CVE-2006-6143 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2006-6143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-6143?

CVE-2006-6143 primarily affects Mit Kerberos 5. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-6143?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2006-6143 published?

CVE-2006-6143 was published on 2006-12-31 and last updated on 2026-06-16.

CVE-2006-6143

CVE-2006-6143 is a critical-severity vulnerability in Mit Kerberos 5 with a CVSS 2.0 base score of 9.3. 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-824.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-824
Affected product: Mit Kerberos 5
Published: 2006-12-31
Last modified: 2026-06-16

Description

The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.

Frequently asked questions

What is CVE-2006-6143?: The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.
How severe is CVE-2006-6143?: CVE-2006-6143 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2006-6143 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-6143?: CVE-2006-6143 primarily affects Mit Kerberos 5. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-6143?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2006-6143 published?: CVE-2006-6143 was published on 2006-12-31 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:a:mit:kerberos_5:1.4:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.5:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.5.1:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.10:*:*:*:*:*:*:*

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