Public Date:
737711: CVE-2011-1527 CVE-2011-1528 CVE-2011-1529 CVE-2011-4151 krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)

The MITRE CVE dictionary describes this issue as:

The lookup_lockout_policy 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 db2 (aka Berkeley DB) or LDAP back end is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via vectors that trigger certain process_as_req errors.

Find out more about CVE-2011-1529 from the MITRE CVE dictionary dictionary and NIST NVD.


Not vulnerable. This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 4 or 5.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 5
Base Metrics 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

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (krb5) RHSA-2011:1379 2011-10-18

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 3 krb5 Not affected
Red Hat Enterprise Linux 5 krb5 Not affected
Red Hat Enterprise Linux 4 krb5 Not affected

External References