How severe is CVE-2011-4963?

CVE-2011-4963 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-4963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4963?

CVE-2011-4963 primarily affects F5 Nginx. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4963?

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

When was CVE-2011-4963 published?

CVE-2011-4963 was published on 2012-07-26 and last updated on 2026-06-16.

CVE-2011-4963

CVE-2011-4963 is a medium-severity vulnerability in F5 Nginx 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.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: F5 Nginx
Published: 2012-07-26
Last modified: 2026-06-16

Description

nginx/Windows 1.3.x before 1.3.1 and 1.2.x before 1.2.1 allows remote attackers to bypass intended access restrictions and access restricted files via (1) a trailing . (dot) or (2) certain "$index_allocation" sequences in a request.

Frequently asked questions

What is CVE-2011-4963?: nginx/Windows 1.3.x before 1.3.1 and 1.2.x before 1.2.1 allows remote attackers to bypass intended access restrictions and access restricted files via (1) a trailing . (dot) or (2) certain "$index_allocation" sequences in a request.
How severe is CVE-2011-4963?: CVE-2011-4963 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-4963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4963?: CVE-2011-4963 primarily affects F5 Nginx. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4963 published?: CVE-2011-4963 was published on 2012-07-26 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx:1.3.0:*:*:*:*:*:*:*

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