How severe is CVE-2011-1528?

CVE-2011-1528 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2011-1528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1528?

CVE-2011-1528 primarily affects Mit Kerberos 5. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1528?

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

When was CVE-2011-1528 published?

CVE-2011-1528 was published on 2011-10-20 and last updated on 2026-06-16.

CVE-2011-1528

CVE-2011-1528 is a high-severity vulnerability in Mit Kerberos 5 with a CVSS 2.0 base score of 7.8. 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-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Mit Kerberos 5
Published: 2011-10-20
Last modified: 2026-06-16

Description

The krb5_ldap_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via unspecified vectors, related to the locked_check_p function. NOTE: the Berkeley DB vector is covered by CVE-2011-4151.

Frequently asked questions

What is CVE-2011-1528?: The krb5_ldap_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via unspecified vectors, related to the locked_check_p function. NOTE: the Berkeley DB vector is covered by CVE-2011-4151.
How severe is CVE-2011-1528?: CVE-2011-1528 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2011-1528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1528?: CVE-2011-1528 primarily affects Mit Kerberos 5. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1528?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-1528 published?: CVE-2011-1528 was published on 2011-10-20 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:a:mit:kerberos_5:1.8:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.8.1:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.8.2:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.8.3:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.8.4:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.9:*:*:*:*:*:*:*
cpe:2.3:a:mit:kerberos_5:1.9.1:*:*:*:*:*:*:*

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