Mozilla Firefox 37.x asm.js Validator memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Mozilla Firefox 37.x (Web Browser). It has been rated as critical. This issue affects some unknown processing of the component asm.js Validator. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The software 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. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 05/12/2015 by Dougall Johnson ( with Intel as MFSA 2015-50 as confirmed security advisory (Website). It is possible to read the advisory at The identification of this vulnerability is CVE-2015-2712 since 03/25/2015. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/17/2022).

The vulnerability scanner Nessus provides a plugin with the ID 83389 (FreeBSD : mozilla -- multiple vulnerabilities (d9b43004-f5fd-4807-b1d7-dbf66455b244)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 167833 (OpenSuSE Security Update for MozillaFirefox (openSUSE-SU-2015:0934-1)).

Upgrading to version 38 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (83389). is providing further details. The entries 75342, 75343, 75344 and 75345 are pretty similar.


  • Mozilla Firefox 37.x
  • Mozilla Firefox ESR 31.6
  • Mozilla Thunderbird 31.6






  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
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VulDB Base Score: 🔍
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Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 83389
Nessus Name: FreeBSD : mozilla -- multiple vulnerabilities (d9b43004-f5fd-4807-b1d7-dbf66455b244)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 803605
OpenVAS Name: Mozilla Firefox Multiple Vulnerabilities-01 May15 (Windows)
OpenVAS File: 🔍
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Qualys ID: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: Upgrade
Status: 🔍

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Upgrade: Firefox 38


03/25/2015 🔍
05/12/2015 +48 days 🔍
05/12/2015 +0 days 🔍
05/12/2015 +0 days 🔍
05/12/2015 +0 days 🔍
05/13/2015 +1 days 🔍
05/13/2015 +0 days 🔍
05/13/2015 +0 days 🔍
05/14/2015 +1 days 🔍
05/17/2022 +2560 days 🔍



Advisory: MFSA 2015-50
Researcher: Dougall Johnson (
Organization: Intel
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-2712 (🔍)
SecurityTracker: 1032301 - Mozilla Firefox Multiple Flaws Let Remote Users Execute Arbitrary Code and Obtain Potentially Sensitive Information and Let Local Users Gain Elevated Privileges
Vulnerability Center: 50137 - Mozilla Firefox Remote Code Execution due to an Error in Heap Lengths, Critical
SecurityFocus: 74611 - Mozilla Firefox and Thunderbird MFSA 2015-48 through -58 Multiple Vulnerabilities

Misc.: 🔍
See also: 🔍


Created: 05/13/2015 12:38 PM
Updated: 05/17/2022 10:27 AM
Changes: 05/13/2015 12:38 PM (74), 06/28/2017 06:37 AM (10), 05/17/2022 10:22 AM (3), 05/17/2022 10:27 AM (1)
Complete: 🔍


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