The krb5_db2_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4, when the db2 (aka…

published 2011-10-20 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4094

cvss: 7.8; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.5%; EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits: 0; none known

The krb5_db2_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4, when the db2 (aka Berkeley DB) back end is used, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via unspecified vectors, a different vulnerability than CVE-2011-1528.

Patch / fix

distros 1

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

debian advisories DEBIAN-CVE-2011-4151

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-2011-4151 updated 2026-11-05 cvss 5.0

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

Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more
affected: no fix available
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

3.54% 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

web.mit.edu /kerberos/advisories/MITKRB5-SA-2011-006.txt
vendor-advisory
kb.cert.org /vuls/id/659251
third-party-advisory, us-government-resource
exchange.xforce.ibmcloud.com /vulnerabilities/70891
vdb-entry

Sources

CVE List CVE-2011-4151
NVD CVE-2011-4151

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.

Summary