Is CVE-2009-3767 in the CISA KEV catalog?

No. CVE-2009-3767 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-3767?

CVE-2009-3767 has a CVSS v2 base score of 4.3 (MEDIUM).

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

CVE-2009-3767 has an EPSS score of 3.09% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-3767?

Upgrade openldap on debian 11 to 2.4.17-2.1 or later.

CVE & CISA-KEV Catalog

CVE-2009-3767

MEDIUMEPSS 86th pctl

4.3

CVSS v2

NVD

Description

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.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

openldapDebian

Fixed in:2.4.17-2.1CVE-2009-3767

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.09%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

openldap.org

Third-Party Advisory14

Other references1

support.apple.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.