CVE-2021-43537

—

CVSS 3.1

8.8 high

EPSS

2%p80

Published

Dec 8, 2021 (Dec 8, 2021)

Modified

Jun 17, 2026

Description

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. 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
Weakness: CWE-704
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (2.0%)

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