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Fencer Vulns
medium 4.3

CVE-2009-3767 json

libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' chara…

published 2009-10-23 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3739

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Patch / fix

  • openldap openldap 2.4.18
  • apple mac_os_x 10.6.2
  • openldap Debian 14, Debian 13, Debian 12 2.4.17-2.1

debian advisories DEBIAN-CVE-2009-3767

  • openldap RHEL 4 2.2.13-12.el4_8.3
  • compat-openldap RHEL 4 2.1.30-12.el4_8.3
  • openldap-clients RHEL 4 2.2.13-12.el4_8.3
  • openldap-servers RHEL 4 2.2.13-12.el4_8.3
  • openldap-servers-sql RHEL 4 2.2.13-12.el4_8.3
  • openldap RHEL 5 2.3.43-12.el5
  • compat-openldap RHEL 5 2.3.43_2.2.29-12.el5
  • openldap-clients RHEL 5 2.3.43-12.el5

red hat advisories RHSA-2010:0543RHSA-2010:0198

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-2009-3767 updated cvss 2.6

OpenLDAP: Doesn't properly handle NULL character in subject Common Name

  • Red Hat Enterprise Linux 6 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) openldap 2.3.43-12.el5, openldap-clients 2.3.43-12.el5, openldap-servers 2.3.43-12.el5, openldap-servers-sql 2.3.43-12.el5, compat-openldap 2.3.43_2.2.29-12.el5, openldap-servers-overlays 2.3.43-12.el5
    fixed: vendor fix RHSA-2010:0198
  • Red Hat Enterprise Linux AS version 4 openldap 2.2.13-12.el4_8.3, compat-openldap 2.1.30-12.el4_8.3, openldap-clients 2.2.13-12.el4_8.3, openldap-servers 2.2.13-12.el4_8.3, openldap-servers-sql 2.2.13-12.el4_8.3
    fixed: vendor fix RHSA-2010:0543
  • Red Hat Enterprise Linux Desktop (v. 5 client) openldap 2.3.43-12.el5, openldap-clients 2.3.43-12.el5, compat-openldap 2.3.43_2.2.29-12.el5
    fixed: vendor fix RHSA-2010:0198
  • Red Hat Enterprise Linux Desktop version 4 openldap 2.2.13-12.el4_8.3, compat-openldap 2.1.30-12.el4_8.3, openldap-clients 2.2.13-12.el4_8.3, openldap-servers 2.2.13-12.el4_8.3, openldap-servers-sql 2.2.13-12.el4_8.3
    fixed: vendor fix RHSA-2010:0543
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) openldap 2.3.43-12.el5, openldap-servers 2.3.43-12.el5, openldap-servers-sql 2.3.43-12.el5, openldap-servers-overlays 2.3.43-12.el5
    fixed: vendor fix RHSA-2010:0198
  • Red Hat Enterprise Linux ES version 4 openldap 2.2.13-12.el4_8.3, compat-openldap 2.1.30-12.el4_8.3, openldap-clients 2.2.13-12.el4_8.3, openldap-servers 2.2.13-12.el4_8.3, openldap-servers-sql 2.2.13-12.el4_8.3 Red Hat Enterprise Linux WS version 4 openldap 2.2.13-12.el4_8.3, compat-openldap 2.1.30-12.el4_8.3, openldap-clients 2.2.13-12.el4_8.3, openldap-servers 2.2.13-12.el4_8.3, openldap-servers-sql 2.2.13-12.el4_8.3
    fixed: vendor fix RHSA-2010:0543
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2011:0896

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

3.26% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns 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.