CVE-2021-43543

MEDIUM · CVSS 6.1 EPSS 1.35%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-12-08 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE

CVE-2021-43543

Severity

MEDIUM

CVSS

6.1

EPSS

1.35%

Firefox

Original NVD Description

Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.