CVE-2013-4547
HighPublic exploitnginx 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.
Published Nov 23, 2013 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2013-4547, DSA-2802-1
Key Facts
Patch immediately- CVE-2013-4547 is a high-severity vulnerability (CVSS 7.5 v2) affecting Nginx (F5), Lifecycle Management Server (Suse), Studio Onsite (Suse) and 9 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 68% probability of exploitation in the next 30 days.
- Fixed versions are available, including Nginx 1.4.4, Nginx 1:1.4.3-1.14.amzn1, Nginx 1.11.4-2.5.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
68%
Higher than 99.3% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2013-4547 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Affected Products
28 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| NginxF5 | See advisory | 1.4.4 |
| Lifecycle Management ServerSuse | 1.3 | n/a |
| Studio OnsiteSuse | 1.3 | n/a |
| WebyastSuse | 1.3 | n/a |
| OpensuseOpensuse | 11.4, 12.2, 12.3, 13.1 | n/a |
Patched Releases
Nginx
1.4.4, 1:1.4.3-1.14.amzn1, 1.11.4-2.5, 1.2.1-2.2+wheezy2, 1.4.4-1
rootio-nginx
1.4.4-1
ruby2.7-rubygem-passenger
6.0.8-3.2
ruby3.0-rubygem-passenger
6.0.8-3.2
rubygem-passenger
6.0.8-3.2
rubygem-passenger-apache2
6.0.8-3.2
rubygem-passenger-nginx
6.0.8-3.2
vim-plugin-nginx
1.11.4-2.5
Timeline
Publicly disclosed
Nov 23, 2013
Last updated
Aug 4, 2026
Weakness Type
- CWE-116 Improper Encoding or Escaping of Output
References
- advisorySUSE-SU-2013:1895
- advisoryopenSUSE-SU-2013:1745
- advisoryopenSUSE-SU-2013:1791
- advisoryopenSUSE-SU-2013:1792
- advisory[nginx-announce] 20131119 nginx security advisory (CVE-2013-4547)
FAQ
Common Questions.
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.
Affected: Nginx (F5); Lifecycle Management Server (Suse) versions 1.3; Studio Onsite (Suse) versions 1.3, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Nginx 1.4.4, Nginx 1:1.4.3-1.14.amzn1, Nginx 1.11.4-2.5.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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