AUGUST 4, 2026
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Case File

CVE-2021-43540

MEDIUM · CVSS 6.5 EPSS 0.86%

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

CyberRota Analysis

AI analysis pending.

CVE
CVE-2021-43540
Severity
MEDIUM
CVSS
6.5
EPSS
0.86%
Firefox

Original NVD Description

WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.

Related CVEs

Other vulnerabilities affecting the same vendor(s)

CVE-2026-16412 CRITICAL CVE-2026-16411 CRITICAL CVE-2026-16410 CRITICAL CVE-2026-16409 HIGH CVE-2026-16408 CRITICAL CVE-2026-16407 CRITICAL