Medium 4.3Published Oct 23, 2009

CVE-2009-3767libraries/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) fiel…

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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It affects openldap and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 4.3 MEDIUM (v2.0, NVD)AV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness (CWE): CWE-295
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

openldap openldap openldap:openldap	before 2.4.18	NVD
apple mac_os_x apple:mac_os_x	before 10.6.2	NVD
fedoraproject fedora fedoraproject:fedora	11	NVD

References

References

http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html	mailing-list, third-party-advisory
http://lists.fedoraproject.org/pipermail/package-announce/2010-March/036138.html	third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html	mailing-list, third-party-advisory
http://marc.info/?l=oss-security&m=125198917018936&w=2	third-party-advisory
http://marc.info/?l=oss-security&m=125369675820512&w=2	third-party-advisory
http://secunia.com/advisories/38769	third-party-advisory
http://secunia.com/advisories/40677	third-party-advisory
http://security.gentoo.org/glsa/glsa-201406-36.xml	third-party-advisory
http://support.apple.com/kb/HT3937	broken-link
http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_o.c.diff?r1=1.8&r2=1.11&f=h	patch, vendor-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.