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CVE-2015-6251

21
FAUCET Score

CVE-2015-6251 is a double free vulnerability affecting GnuTLS versions before 3.3.17 and 3.4.x before 3.4.4, specifically impacting Debian Linux and GnuTLS products. This vulnerability allows remote attackers to trigger a denial of service by providing an excessively long DistinguishedName entry within a certificate. With a CVSS score of 5.0, it is a medium-severity vulnerability requiring no authentication, with low attack complexity, and its primary impact is availability. There is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and it has received minimal community discussion and media coverage, indicating low current attention.

Impacted Technologies

VendorProductVersion(s)CPE
3.3.0CPE matchmatch criteria
cpe:2.3:a:gnu:gnutls:3.3.0:-:*:*:*:*:*:*
3.3.0CPE matchmatch criteria
cpe:2.3:a:gnu:gnutls:3.3.0:pre0:*:*:*:*:*:*
3.3.1CPE matchmatch criteria
cpe:2.3:a:gnu:gnutls:3.3.1:*:*:*:*:*:*:*
3.3.2CPE matchmatch criteria
cpe:2.3:a:gnu:gnutls:3.3.2:*:*:*:*:*:*:*
3.3.3CPE matchmatch criteria
cpe:2.3:a:gnu:gnutls:3.3.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
19.03%
Probability of exploitation in next 30 days
EPSS Percentile
97.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1903 is in the 97th percentile among its peer group of 23,723 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: gnutls

Vendor Advisories (1)

redhatCVE-2015-6251Moderate

gnutls: double free flaw in certificate DN decoding (GNUTLS-SA-2015-3)

Aug 10, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-September/165286.html
lists.opensuse.org / opensuse-updates/2015-09/msg00001.html
bugzilla.redhat.com / show_bug.cgi
gitlab.com / gnutls/gnutls/commit/272854367efc130fbd4f1a51840d80c630214e12
debian.org / security/2015/dsa-3334
gnutls.org / security.html
Vendor Advisory
openwall.com / lists/oss-security/2015/08/10/1
openwall.com / lists/oss-security/2015/08/17/6
securityfocus.com / bid/76267
securitytracker.com / id/1033226