CVE-2021-43541

—

CVSS 3.1

6.5 medium

EPSS

2%p74

Published

Dec 8, 2021 (Dec 8, 2021)

Modified

Jun 17, 2026

Description

When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

Vendors: mozilla debian
Products: firefox, firefox esr, thunderbird, debian linux
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (1.6%)

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