CVE-2013-4547

CVE-2013-4547 is a high-severity vulnerability in F5 Nginx with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 68% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-116.

Key facts

Description

nginx 0.8.41 through 1.4.3 and 1.5.x before 1.5.7 allows remote attackers to bypass intended restrictions via an unescaped space character in a URI.

Frequently asked questions

What is CVE-2013-4547?
nginx 0.8.41 through 1.4.3 and 1.5.x before 1.5.7 allows remote attackers to bypass intended restrictions via an unescaped space character in a URI.
How severe is CVE-2013-4547?
CVE-2013-4547 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2013-4547 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 68% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-4547?
CVE-2013-4547 primarily affects F5 Nginx. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-4547?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2013-4547 published?
CVE-2013-4547 was published on 2013-11-23 and last updated on 2026-06-16.

References

Affected products (8)

More vulnerabilities in F5 Nginx

All CVEs affecting F5 Nginx →

Other CWE-116 vulnerabilities

Browse all CWE-116 vulnerabilities →