--- title: "CVE-2011-2501\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-2011-2501?format=md keywords: index, follow --- # CVE-2011-2501 Publication date 17 July 2011 Last updated 25 August 2025 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **6.5 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2011-2501?format=md#impact-score) Toggle side navigation ## Description The png\_format\_buffer function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 allows remote attackers to cause a denial of service (application crash) via a crafted PNG image that triggers an out-of-bounds read during the copying of error-message data. NOTE: this vulnerability exists because of a CVE-2004-0421 regression. NOTE: this is called an off-by-one error by some sources. [Read the notes from the security team](https://ubuntu.com/security/CVE-2011-2501?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | chromium-browser | 12.04 LTS precise | Not affected | | 11.10 oneiric | Fixed 14.0.835.202~r103287-0ubuntu1 | | 11.04 natty | Fixed 14.0.835.202~r103287-0ubuntu0.11.04.1 | | 10.10 maverick | Fixed 14.0.835.202~r103287-0ubuntu0.10.10.1 | | 10.04 LTS lucid | Fixed 14.0.835.202~r103287-0ubuntu0.10.04.2 | | 8.04 LTS hardy | Not in release | | firefox | 12.04 LTS precise | Fixed 8.0~b4+build1-0ubuntu2 | | 11.10 oneiric | Fixed 8.0+build1-0ubuntu0.11.10.1 | | 11.04 natty | Fixed 8.0+build1-0ubuntu0.11.04.1 | | 10.10 maverick | Ignored end of life | | 10.04 LTS lucid | Fixed 10.0+build1-0ubuntu0.10.04.2 | | 8.04 LTS hardy | Ignored end of life | | libpng | 12.04 LTS precise | Not affected | | 11.10 oneiric | Not affected | | 11.04 natty | Fixed 1.2.44-1ubuntu3.1 | | 10.10 maverick | Fixed 1.2.44-1ubuntu0.1 | | 10.04 LTS lucid | Fixed 1.2.42-1ubuntu2.2 | | 8.04 LTS hardy | 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-2011-2501?format=md#patch-details) ## Notes --- ### [mdeslaur](https://launchpad.net/~mdeslaur) re-introduced in 1.2.23 --- ### [jdstrand](https://launchpad.net/~jdstrand) firefox 3.6.23 has 1.2.35 and 7.0.1 has 1.4.7 --- ### [micahg](https://launchpad.net/~micahg) firefox 8 will have 1.4.8 ### 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 | | --- | --- | | libpng | * Upstream: | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 6.5 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | Required | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 6.5 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2501) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-2501) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-2501) * [Debian](https://security-tracker.debian.org/tracker/CVE-2011-2501) ### Related Ubuntu Security Notices (USN) + [USN-1175-1](https://usn.ubuntu.com/USN-1175-1) + libpng vulnerabilities + 26 July 2011 ### Other references *