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Fencer Intel
medium 4.6

CVE-2011-1024 json

chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (a…

published 2011-03-20 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1041

cvss
4.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (aka authentication-failure forwarding) is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server.

Patch / fix

  • openldap Debian 14, Debian 13, Debian 12 2.4.25-1

debian advisories DEBIAN-CVE-2011-1024

  • openldap RHEL 6 2.4.19-15.el6_0.2
  • compat-openldap RHEL 6 2.4.19_2.3.43-15.el6_0.2
  • openldap-clients RHEL 6 2.4.19-15.el6_0.2
  • openldap-servers RHEL 6 2.4.19-15.el6_0.2
  • openldap-servers-sql RHEL 6 2.4.19-15.el6_0.2
  • openldap RHEL 5 2.3.43-12.el5_6.7
  • compat-openldap RHEL 5 2.3.43_2.2.29-12.el5_6.7
  • openldap-clients RHEL 5 2.3.43-12.el5_6.7

red hat advisories RHSA-2011:0347RHSA-2011:0346

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-2011-1024 updated cvss 5.1

openldap: forwarded bind failure messages cause success

  • Red Hat Enterprise Linux (v. 5.6.z server) openldap 2.3.43-12.el5_6.7, openldap-clients 2.3.43-12.el5_6.7, openldap-servers 2.3.43-12.el5_6.7, openldap-servers-sql 2.3.43-12.el5_6.7, compat-openldap 2.3.43_2.2.29-12.el5_6.7, openldap-servers-overlays 2.3.43-12.el5_6.7
    fixed: vendor fix RHSA-2011:0346
  • Red Hat Enterprise Linux Desktop (v. 6) openldap 2.4.19-15.el6_0.2, openldap-clients 2.4.19-15.el6_0.2, compat-openldap 2.4.19_2.3.43-15.el6_0.2 Red Hat Enterprise Linux Desktop Optional (v. 6) openldap 2.4.19-15.el6_0.2, openldap-servers 2.4.19-15.el6_0.2, openldap-servers-sql 2.4.19-15.el6_0.2 Red Hat Enterprise Linux HPC Node (v. 6) openldap 2.4.19-15.el6_0.2, compat-openldap 2.4.19_2.3.43-15.el6_0.2 Red Hat Enterprise Linux HPC Node Optional (v. 6) openldap 2.4.19-15.el6_0.2, openldap-clients 2.4.19-15.el6_0.2, openldap-servers 2.4.19-15.el6_0.2, openldap-servers-sql 2.4.19-15.el6_0.2 Red Hat Enterprise Linux Server (v. 6) openldap 2.4.19-15.el6_0.2, openldap-clients 2.4.19-15.el6_0.2, openldap-servers 2.4.19-15.el6_0.2, compat-openldap 2.4.19_2.3.43-15.el6_0.2 Red Hat Enterprise Linux Server Optional (v. 6) openldap 2.4.19-15.el6_0.2, openldap-servers-sql 2.4.19-15.el6_0.2
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) openldap 2.4.19-15.el6_0.2, openldap-clients 2.4.19-15.el6_0.2, openldap-servers 2.4.19-15.el6_0.2, compat-openldap 2.4.19_2.3.43-15.el6_0.2 Red Hat Enterprise Linux Workstation Optional (v. 6) openldap 2.4.19-15.el6_0.2, openldap-servers-sql 2.4.19-15.el6_0.2
    fixed: vendor fix RHSA-2011:0347
  • Red Hat Enterprise Linux 4 openldap
    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

2.59% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.6 AV:N/AC:H/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

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.