Mozilla Firefox up to 50 Editor use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 50 (Web Browser). Affected is an unknown functionality of the component Editor. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Use-after-free resulting in potentially exploitable crash when manipulating DOM subtrees in the Editor. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

The bug was discovered 12/13/2016. The weakness was shared 12/13/2016 by Christian Holler (Nils) as MFSA 2016-94 as confirmed security advisory (Website). The advisory is available at This vulnerability is traded as CVE-2016-9898 since 12/07/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/08/2022).

The vulnerability scanner Nessus provides a plugin with the ID 900006 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236208 (Red Hat Update Firefox Security (RHSA-2016:2946)).

Upgrading to version 50.1 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 (900006).







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍


VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍


Class: Use after free
CWE: CWE-416 / CWE-119

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 900006
Nessus File: 🔍

OpenVAS ID: 881932
OpenVAS Name: CentOS Update for firefox CESA-2016:2946 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Firefox 50.1


12/07/2016 🔍
12/13/2016 +6 days 🔍
12/13/2016 +0 days 🔍
12/13/2016 +0 days 🔍
12/13/2016 +0 days 🔍
12/15/2016 +2 days 🔍
06/11/2018 +542 days 🔍
10/08/2022 +1580 days 🔍



Advisory: MFSA 2016-94
Researcher: Christian Holler (Nils)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-9898 (🔍)

SecurityTracker: 1037461
SecurityFocus: 94885 - Mozilla Firefox MFSA2016-94 and MFSA2016-95 Multiple Security Vulnerabilities


Created: 12/15/2016 10:45 AM
Updated: 10/08/2022 04:34 PM
Changes: 12/15/2016 10:45 AM (73), 07/07/2019 09:30 PM (7), 10/08/2022 04:34 PM (3)
Complete: 🔍
Cache ID: 100:5C9:40


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