CVE-2021-43537

HighCVSS 8.8/10Last 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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-704

Affected software

No affected versions have been published.

Timeline

Published: Dec 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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