AUGUST 4, 2026
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Case File

CVE-2021-23984

MEDIUM · CVSS 6.5 EPSS 1.11%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-31 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2021-23984
Severity
MEDIUM
CVSS
6.5
EPSS
1.11%
Firefox

Original NVD Description

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.