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Fencer Intel
high 7.8

CVE-2011-1527 json

The kdb_ldap plugin in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.1, when the LDAP back end is used, al…

published 2011-10-20 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1528

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The kdb_ldap plugin in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a kinit operation with incorrect string case for the realm, related to the is_principal_in_realm, krb5_set_error_message, krb5_ldap_get_principal, and process_as_req functions.

Patch / fix

  • krb5 Debian 14, Debian 13, Debian 12 1.10+dfsg~alpha1-1

debian advisories DEBIAN-CVE-2011-1527

  • krb5 RHEL 6 1.9-9.el6_1.2
  • krb5-libs RHEL 6 1.9-9.el6_1.2
  • krb5-server RHEL 6 1.9-9.el6_1.2
  • krb5-server-ldap RHEL 6 1.9-9.el6_1.2
  • krb5-workstation RHEL 6 1.9-9.el6_1.2
  • krb5-pkinit-openssl RHEL 6 1.9-9.el6_1.2

red hat advisories RHSA-2011:1379

  • krb5 openSUSE Tumbleweed 1.15-1.1

opensuse advisories openSUSE-SU-2024:10004-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-1527 updated cvss 5.0

krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)

  • Red Hat Enterprise Linux Server (v. 6) krb5 1.9-9.el6_1.2, krb5-libs 1.9-9.el6_1.2, krb5-server 1.9-9.el6_1.2, krb5-server-ldap 1.9-9.el6_1.2, krb5-workstation 1.9-9.el6_1.2, krb5-pkinit-openssl 1.9-9.el6_1.2
    fixed: vendor fix RHSA-2011:1379
  • Red Hat Enterprise Linux 4 krb5 Red Hat Enterprise Linux 5 krb5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.65% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.