How severe is CVE-2007-3999?

CVE-2007-3999 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2007-3999 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3999?

CVE-2007-3999 primarily affects Mit Kerberos 5. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-3999?

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-2007-3999 published?

CVE-2007-3999 was published on 2007-09-05 and last updated on 2026-06-16.

CVE-2007-3999

CVE-2007-3999 is a critical-severity vulnerability in Mit Kerberos 5 with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Mit Kerberos 5
Published: 2007-09-05
Last modified: 2026-06-16

Description

Stack-based buffer overflow in the svcauth_gss_validate function in lib/rpc/svc_auth_gss.c in the RPCSEC_GSS RPC library (librpcsecgss) in MIT Kerberos 5 (krb5) 1.4 through 1.6.2, as used by the Kerberos administration daemon (kadmind) and some third-party applications that use krb5, allows remote attackers to cause a denial of service (daemon crash) and probably execute arbitrary code via a long string in an RPC message.

Frequently asked questions

What is CVE-2007-3999?: Stack-based buffer overflow in the svcauth_gss_validate function in lib/rpc/svc_auth_gss.c in the RPCSEC_GSS RPC library (librpcsecgss) in MIT Kerberos 5 (krb5) 1.4 through 1.6.2, as used by the Kerberos administration daemon (kadmind) and some third-party applications that use krb5, allows remote attackers to cause a denial of service (daemon crash) and probably execute arbitrary code via a long string in an RPC message.
How severe is CVE-2007-3999?: CVE-2007-3999 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2007-3999 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3999?: CVE-2007-3999 primarily affects Mit Kerberos 5. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3999?: 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-2007-3999 published?: CVE-2007-3999 was published on 2007-09-05 and last updated on 2026-06-16.

References

Affected products (12)

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:a:mit:kerberos_5:1.5.2:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.5.3:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.6:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.6.2:*:*:*:*:*:*:*

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