Mozilla Firefox 44 Deleted Pointer Object use after free

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability classified as critical was found in Mozilla Firefox 44 (Web Browser). Affected by this vulnerability is an unknown function of the component Deleted Pointer Handler. The manipulation with an unknown input leads to a use after free vulnerability (Object). The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox before 45.0 on Windows might allow remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

The weakness was published 03/08/2016 by Ronald Crane as MFSA 2016-32 as confirmed security advisory (Website). It is possible to read the advisory at This vulnerability is known as CVE-2016-1976 since 01/20/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. 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 07/09/2022).

The vulnerability scanner Nessus provides a plugin with the ID 89765 (FreeBSD : mozilla -- multiple vulnerabilities (2225c5b4-1e5a-44fc-9920-b3201c384a15)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Upgrading 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 (111356), Tenable (89765), SecurityFocus (BID 84220†) and Vulnerability Center (SBV-57164†).







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.0

VulDB Base Score: 9.8
VulDB Temp Score: 8.5
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NVD Base Score: 5.5
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Name: Object
Class: Use after free / Object
CWE: CWE-416 / CWE-119

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Current Price Estimation: 🔍


Nessus ID: 89765
Nessus Name: FreeBSD : mozilla -- multiple vulnerabilities (2225c5b4-1e5a-44fc-9920-b3201c384a15)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 802891
OpenVAS Name: Mozilla Firefox Multiple Vulnerabilities - Mar16 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Recommended: Upgrade
Status: 🔍

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01/20/2016 🔍
03/07/2016 +47 days 🔍
03/07/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/09/2016 +0 days 🔍
03/13/2016 +4 days 🔍
07/09/2022 +2309 days 🔍



Advisory: MFSA 2016-32
Researcher: Ronald Crane
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1976 (🔍)
X-Force: 111356 - Mozilla Firefox deleted pointers security bypass
SecurityFocus: 84220 - Mozilla Firefox Multiple Security Vulnerabilities
SecurityTracker: 1035215
Vulnerability Center: 57164 - Mozilla Firefox <45 on Windows Remote Unspecified Vulnerability DesktopDisplayDevice::operator= in WebRTC and LibVPX - CVE-2016-1976, Medium


Created: 03/09/2016 10:22 AM
Updated: 07/09/2022 02:23 PM
Changes: 03/09/2016 10:22 AM (69), 09/02/2018 10:37 AM (19), 07/09/2022 02:23 PM (4)
Complete: 🔍
Cache ID: 3:1E5:40


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