The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
If an attacker is able to alter specific about:config values (for example malware running on the user's computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user's browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket. This vulnerability affects Firefox < 87.
Base Score: 4.3
Impact Score: 2.9
Exploitability Score: 8.6
Base Score: 6.5
Impact Score: 3.6
Exploitability Score: 2.8
|149233||GLSA-202104-10 : Mozilla Firefox: Multiple vulnerabilities||Nessus||Gentoo Local Security Checks|
|148135||Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4893-1)||Nessus||Ubuntu Local Security Checks|
|148015||Mozilla Firefox < 87.0||Nessus||MacOS X Local Security Checks|
|148014||Mozilla Firefox < 87.0||Nessus||Windows|