Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-23984

A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 50.0%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 4.3
Products affected by CVE-2021-23984


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