CVE-2015-2091 — The authentication hook (mgs_hook_authz) in mod-gnutls 0.5.10 and earlier does not validate client certificates when "GnuTLSClientVerify require" is set, which allows remote attackers to spoof clients via a crafted certificate

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MEDIUM

The authentication hook (mgs_hook_authz) in mod-gnutls 0.5.10 and earlier does not validate client certificates when "GnuTLSClientVerify require" is set, which allows remote attackers to spoof clients via a crafted certificate

Published Mar 13, 2015

5.0

MEDIUM

CVSS 2.0

EPSS 3.25%

Description

The authentication hook (mgs_hook_authz) in mod-gnutls 0.5.10 and earlier does not validate client certificates when "GnuTLSClientVerify require" is set, which allows remote attackers to spoof clients via a crafted certificate.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.25% 0.03250

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.03250

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	3.25% (0.03250)	87.90th	v5 (v2026.06.15)
Jun 15, 2026	3.27% (0.03274)	86.77th	v5 (v2026.06.15)
Mar 17, 2025	0.94% (0.00944)	74.70th	v4 (v2025.03.14)
Dec 12, 2024	0.13% (0.00133)	50.13th	v3 (v2023.03.01)
Jun 14, 2024	0.13% (0.00133)	48.66th	v3 (v2023.03.01)
Mar 7, 2023	0.13% (0.00133)	46.64th	v3 (v2023.03.01)
Mar 6, 2023	1.48% (0.01484)	73.53th	v2 (v2022.01.01)
Mar 3, 2023	1.48% (0.01484)	73.52th	v2 (v2022.01.01)
Apr 1, 2022	1.48% (0.01484)	71.52th	v2 (v2022.01.01)
Feb 4, 2022	1.48% (0.01484)	50.61th	v2 (v2022.01.01)

Weaknesses (1)

CWE-310

References (4)

http://issues.outoforder.cc/view.php?id=93
x_refsource_MISCVendor Advisory
http://www.debian.org/security/2015/dsa-3177
vendor-advisoryx_refsource_DEBIAN
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=578663
x_refsource_CONFIRM
https://security.gentoo.org/glsa/201709-04
vendor-advisoryx_refsource_GENTOO

Link	Providers	Tags
http://issues.outoforder.cc/view.php?id=93		x_refsource_MISCVendor Advisory
http://www.debian.org/security/2015/dsa-3177		vendor-advisoryx_refsource_DEBIAN
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=578663		x_refsource_CONFIRM
https://security.gentoo.org/glsa/201709-04		vendor-advisoryx_refsource_GENTOO

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Mar 13, 2015

Updated Aug 6, 2024

Reserved Feb 26, 2015

Link CVE-2015-2091

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-2091

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-2091