# CVE-2013-4547: Security feature bypass in n/a

> Remote attackers can bypass intended restrictions in nginx by using an unescaped space character in the URI.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Nov 2013
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2013-4547, DSA-2802-1, GHSA-9x2q-qf8w-h347, MGASA-2013-0349

## What is CVE-2013-4547?

CVE-2013-4547 is a high-severity vulnerability in Opensuse Opensuse, published on 23 Nov 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2013-4547?

It affects 5 products.


Products: F5 Nginx, Opensuse Opensuse, Suse Lifecycle Management Server, Suse Studio Onsite, Suse Webyast.

## How do I fix CVE-2013-4547?

Upgrade to a fixed version.

## Is CVE-2013-4547 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2013-4547 exists.

Public exploit code:

- https://github.com/cyberharsh/Nginx-CVE-2013-4547 (github_poc): https://github.com/cyberharsh/Nginx-CVE-2013-4547
- Nginx 1.1.17 - URI Processing SecURIty Bypass (exploitdb)
- https://github.com/rsp243/fix_nginx_CVE-2013-4547_IB (github_poc): https://github.com/rsp243/fix_nginx_CVE-2013-4547_IB
- Vulhub nginx/CVE-2013-4547: Nginx Filename Logic Vulnerability (CVE-2013-4547), run with Isoloom (github_poc): https://github.com/CyberCTF/vulhub-nginx-cve-2013-4547

## Other vulnerabilities in Opensuse Opensuse

- [CVE-2016-1247](https://insights.sbomify.com/CVE-2016-1247/): Path traversal in n/a (high 7.8)
- [CVE-2021-23017](https://insights.sbomify.com/CVE-2021-23017/): Memory corruption in Nginx Web Server, Nginx Plus (high 7.7)
- [CVE-2014-0088](https://insights.sbomify.com/CVE-2014-0088/): Memory corruption in n/a (high 7.5)
- [CVE-2014-0133](https://insights.sbomify.com/CVE-2014-0133/): Memory corruption in n/a (high 7.5)
- [CVE-2013-0337](https://insights.sbomify.com/CVE-2013-0337/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-4547 and fix it if it is affected.

What it is: CVE-2013-4547 is a high-severity vulnerability in Opensuse Opensuse, published on 23 Nov 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2013-4547 exists.

Affected product: Opensuse Opensuse. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2013-4547/ (Markdown: https://insights.sbomify.com/CVE-2013-4547/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-4547
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-4547
- OSV: https://osv.dev/vulnerability/CVE-2013-4547

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-4547/
Summaries are generated and may contain mistakes; the official description above is the record.