Mozilla Firefox up to 55 Design Mode use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Mozilla Firefox up to 55. The affected element is an unknown function of the component Design Mode. Such manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2017-7819. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 55 (Web Browser). It has been rated as critical. Affected by this issue is an unknown part of the component Design Mode. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The bug was discovered 09/28/2017. The weakness was disclosed 09/28/2017 by Nils as MFSA 2017-21 as confirmed security advisory (Website). The advisory is shared for download at mozilla.org. This vulnerability is handled as CVE-2017-7819 since 04/12/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 108820 (GLSA-201803-14 : Mozilla Thunderbird: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370584 (Mozilla Firefox Multiple Vulnerabilities. (mfsa2017-21,mfsa2017-22)).

Upgrading to version 56 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 Tenable (108820), SecurityFocus (BID 101055†) and SecurityTracker (ID 1039465†). The entries VDB-107430, VDB-107431, VDB-107433 and VDB-107434 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108820
Nessus Name: GLSA-201803-14 : Mozilla Thunderbird: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3987-1 (firefox-esr - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Firefox 56

Timelineinfo

04/12/2017 🔍
09/28/2017 +169 days 🔍
09/28/2017 +0 days 🔍
09/28/2017 +0 days 🔍
09/28/2017 +0 days 🔍
09/29/2017 +1 days 🔍
10/04/2017 +5 days 🔍
04/04/2018 +182 days 🔍
06/11/2018 +67 days 🔍
11/26/2025 +2725 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2017-21
Researcher: Abhishek Arya, Nils (Nils)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7819 (🔍)
GCVE (CVE): GCVE-0-2017-7819
GCVE (VulDB): GCVE-100-107432

OVAL: 🔍

SecurityFocus: 101055 - Mozilla Firefox and Firefox ESR Multiple Use After Free Denial of Service Vulnerabilities
SecurityTracker: 1039465

See also: 🔍

Entryinfo

Created: 10/04/2017 11:52
Updated: 11/26/2025 06:09
Changes: 10/04/2017 11:52 (80), 11/21/2019 19:20 (6), 01/15/2021 11:46 (2), 01/15/2021 11:49 (1), 11/26/2025 06:09 (16)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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