Mozilla Firefox 30.0/31.0/31.1.0/32.0 CSS Parser nsTransformedTextRun memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Mozilla Firefox 30.0/31.0/31.1.0/32.0 (Web Browser). It has been declared as critical. Affected by this vulnerability is the function nsTransformedTextRun of the component CSS Parser. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 10/14/2014 by Atte Kettunen as MFSA2014-75 as confirmed advisory (Website). It is possible to read the advisory at This vulnerability is known as CVE-2014-1576 since 01/16/2014. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/21/2022).

The vulnerability scanner Nessus provides a plugin with the ID 78489 (CentOS 5 / 6 / 7 : firefox (CESA-2014:1635)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 122754 (Red Hat Update for Xulrunner firefox (RHSA-2014:1635)).

Upgrading to version 33 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (97003) and Tenable (78489). Additional details are provided at Similar entries are available at 67793, 67794, 67796 and 67797.


  • Mozilla Firefox 32.0
  • Mozilla Firefox ESR 31.1
  • Mozilla Thunderbird 31.1







CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 8.7

VulDB Base Score: 10.0
VulDB Temp Score: 8.7
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Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Current Price Estimation: 🔍


Nessus ID: 78489
Nessus Name: CentOS 5 / 6 / 7 : firefox (CESA-2014:1635)
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Nessus Risk: 🔍
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OpenVAS ID: 703050
OpenVAS Name: Debian Security Advisory DSA 3050-1 (iceweasel - security update)
OpenVAS File: 🔍
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Threat Intelligenceinfo

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Recommended: Upgrade
Status: 🔍

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Upgrade: Firefox 33


01/16/2014 🔍
10/14/2014 +271 days 🔍
10/14/2014 +0 days 🔍
10/14/2014 +0 days 🔍
10/14/2014 +0 days 🔍
10/14/2014 +0 days 🔍
10/15/2014 +1 days 🔍
10/15/2014 +0 days 🔍
10/15/2014 +0 days 🔍
02/21/2022 +2686 days 🔍



Advisory: MFSA2014-75
Researcher: Atte Kettunen
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-1576 (🔍)

X-Force: 97003 - Mozilla Firefox andThunderbird nsTransformedTextRun() buffer overflow, High Risk
SecurityTracker: 1031028 - Mozilla Firefox Bugs Let Remote Users Execute Arbitrary Code, Bypass Same Origin-Policy, and Obtain Potentially Sensitive Information
Vulnerability Center: 46468 - Mozilla Firefox <33, Firefox ESR <31.2 and Thunderbird <31.2 Remote DoS - CVE-2014-1576, High
SecurityFocus: 70430 - Mozilla Firefox/Thunderbird CVE-2014-1576 Remote Heap Buffer Overflow Vulnerability
Secunia: 61387

Misc.: 🔍
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Created: 10/15/2014 10:53 AM
Updated: 02/21/2022 08:09 PM
Changes: 10/15/2014 10:53 AM (88), 06/08/2017 10:28 AM (3), 02/21/2022 08:01 PM (2), 02/21/2022 08:09 PM (1)
Complete: 🔍


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