How severe is CVE-2013-4566?

CVE-2013-4566 has a CVSS 2.0 base score of 4.0, rated medium severity.

Is CVE-2013-4566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-4566?

CVE-2013-4566 primarily affects Redhat Enterprise Linux. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-4566?

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

When was CVE-2013-4566 published?

CVE-2013-4566 was published on 2013-12-12 and last updated on 2026-06-16.

CVE-2013-4566

CVE-2013-4566 is a medium-severity vulnerability in Redhat Enterprise Linux with a CVSS 2.0 base score of 4.0. 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-264.

Key facts

Severity: Medium (CVSS 2.0 base score 4.0)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Redhat Enterprise Linux
Published: 2013-12-12
Last modified: 2026-06-16

Description

mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.

Frequently asked questions

What is CVE-2013-4566?: mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
How severe is CVE-2013-4566?: CVE-2013-4566 has a CVSS 2.0 base score of 4.0, rated medium severity.
Is CVE-2013-4566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-4566?: CVE-2013-4566 primarily affects Redhat Enterprise Linux. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-4566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-4566 published?: CVE-2013-4566 was published on 2013-12-12 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:mod_nss_project:mod_nss:*:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mod_nss_project:mod_nss:1.0.7:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:5:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*

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