Is CVE-2015-6251 in the CISA KEV catalog?

No. CVE-2015-6251 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-6251?

CVE-2015-6251 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2015-6251?

CVE-2015-6251 has an EPSS score of 19.03% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2015-6251

MEDIUMEPSS 97th pctl

5.0

CVSS v2

NVD

Description

Double free vulnerability in GnuTLS before 3.3.17 and 3.4.x before 3.4.4 allows remote attackers to cause a denial of service via a long DistinguishedName (DN) entry in a certificate.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

19.03%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-September/165286.html
http://lists.opensuse.org/opensuse-updates/2015-09/msg00001.html
http://www.debian.org/security/2015/dsa-3334
http://www.gnutls.org/security.html#GNUTLS-SA-2015-3
http://www.openwall.com/lists/oss-security/2015/08/10/1
http://www.openwall.com/lists/oss-security/2015/08/17/6
http://www.securityfocus.com/bid/76267
http://www.securitytracker.com/id/1033226
https://bugzilla.redhat.com/show_bug.cgi?id=1251902
https://gitlab.com/gnutls/gnutls/commit/272854367efc130fbd4f1a51840d80c630214e12

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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 2026-05-06.