---
title: "CVE-2011-0420\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2011-0420?format=md
keywords: index, follow
---

# CVE-2011-0420

Publication date 18 February 2011

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## Description

The grapheme\_extract function in the Internationalization extension (Intl)
for ICU for PHP 5.3.5 allows context-dependent attackers to cause a denial
of service (crash) via an invalid size argument, which triggers a NULL
pointer dereference.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-0420?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| php5 | 11.04 natty | Fixed 5.3.5-1ubuntu7.1 |
| 10.10 maverick | Fixed 5.3.3-1ubuntu9.4 |
| 10.04 LTS lucid | Fixed 5.3.2-1ubuntu4.8 |
| 9.10 karmic | Not affected |
| 8.04 LTS hardy | Not affected |
| 6.06 LTS dapper | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2011-0420?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

ICU support introduced in 5.3.0, so <lucid is not affected.

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| php5 | * Upstream:   <http://svn.php.net/viewvc?view=revision&revision=306449> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0420)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-0420)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-0420)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-0420)

### Related Ubuntu Security Notices (USN)

+ [USN-1126-1](https://usn.ubuntu.com/USN-1126-1)
+ PHP vulnerabilities
+ 29 April 2011

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2011-0420>