CVE-2021-23985

medium
New! CVE Severity Now Using CVSS v3

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.

Description

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.

References

https://www.mozilla.org/security/advisories/mfsa2021-10/

https://bugzilla.mozilla.org/show_bug.cgi?id=1659129

Details

Source: MITRE

Published: 2021-03-31

Updated: 2021-08-06

Type: CWE-668

Risk Information

CVSS v2

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 2.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Tenable Plugins

View all (4 total)

IDNameProductFamilySeverity
149233GLSA-202104-10 : Mozilla Firefox: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
148135Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4893-1)NessusUbuntu Local Security Checks
high
148015Mozilla Firefox < 87.0NessusMacOS X Local Security Checks
high
148014Mozilla Firefox < 87.0NessusWindows
high