Is CVE-2009-3767 being actively exploited?

CVE-2009-3767 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-3767?

CVE-2009-3767 has a CVSS 2.0 base score of 4.3 (MEDIUM).

CVE-2009-3767

MEDIUM · CVSS 4.3EPSS 3.3%EU EUVD

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.

Key facts

CVSS score: 4.3 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness (CWE): CWE-295
EPSS score: 3.3% (88th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-3739)
Published: October 23, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-3739 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

apple / mac os x
fedoraproject / fedora
openldap / openldap
openssl / openssl

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Apple Mac OS X 10.6 - Apple Inc. - Common Criteria BSI-DSZ-CC-0536-2010 - archived
Apple Mac OS X v10.3.6 and Apple Mac OS X Server V10.3.6 - Apple Inc. - Common Criteria CCEVS-VR-0086-2005 - archived

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)
http://www.redhat.com/support/errata/RHSA-2010-0543.html(Third Party Advisory)
http://www.redhat.com/support/errata/RHSA-2011-0896.html(Third Party Advisory)
http://www.vupen.com/english/advisories/2009/3056(Third Party Advisory)
http://www.vupen.com/english/advisories/2010/1858(Third Party Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11178(Third Party Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7274(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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