# CVE-2013-3735: Denial of service in n/a

> Attackers can cause a denial of service via memory consumption and application crash by submitting crafted function definitions to the PHP Zend Engine.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 May 2013
- **Updated:** 16 Jan 2025
- **Also known as:** GHSA-5jh5-7283-3xvx

## What is CVE-2013-3735?

CVE-2013-3735 is a high-severity denial of service vulnerability in Php Php, published on 31 May 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment.  NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2013-3735?

It affects 1 product.


Products: Php Php.

## How do I fix CVE-2013-3735?

No fix has been published for CVE-2013-3735 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-3735 being exploited?

There is no known exploitation of CVE-2013-3735 in the wild and no public exploit code.

## Other vulnerabilities in Php Php

- [CVE-2012-2688](https://insights.sbomify.com/CVE-2012-2688/): Integer overflow in n/a (critical 10.0)
- [CVE-2012-2376](https://insights.sbomify.com/CVE-2012-2376/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-3268](https://insights.sbomify.com/CVE-2011-3268/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-4143](https://insights.sbomify.com/CVE-2009-4143/): Other in n/a (critical 10.0)
- [CVE-2008-5557](https://insights.sbomify.com/CVE-2008-5557/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-3735 and fix it if it is affected.

What it is: CVE-2013-3735 is a high-severity denial of service vulnerability in Php Php, published on 31 May 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2013-3735 in the wild and no public exploit code.

Affected product: Php Php. 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-2013-3735/ (Markdown: https://insights.sbomify.com/CVE-2013-3735/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-3735
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-3735
- OSV: https://osv.dev/vulnerability/CVE-2013-3735

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-3735/
Summaries are generated and may contain mistakes; the official description above is the record.