How severe is CVE-2015-2091?

CVE-2015-2091 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-2091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-2091?

CVE-2015-2091 affects Apache Mod-gnutls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-2091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-2091 published?

CVE-2015-2091 was published on 2015-03-13 and last updated on 2026-06-17.

CVE-2015-2091

CVE-2015-2091 is a medium-severity vulnerability in Apache Mod-gnutls with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Apache Mod-gnutls
Published: 2015-03-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2015-2091?: CVE-2015-2091 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-2091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-2091?: CVE-2015-2091 affects Apache Mod-gnutls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-2091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-2091 published?: CVE-2015-2091 was published on 2015-03-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:mod-gnutls:*:*:*:*:*:*:*:*

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