CVE-2021-29945

MEDIUM

Firefox ESR <78.10 & Firefox <88 - Memory Corruption

Title source: llm

Description

The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

References (4)

[Release Notes, Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2021-14/

[Release Notes, Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2021-16/

[Release Notes, Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2021-15/

[Issue Tracking, Permissions Required, Vendor Advisory] https://bugzilla.mozilla.org/show_bug.cgi?id=1700690

Scores

CVSS v3 6.5

EPSS 0.0041

EPSS Percentile 61.3%

Attack Vector NETWORK

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

Details

CWE

CWE-682

Status published

Products (3)

mozilla/firefox < 88.0

mozilla/firefox_esr < 78.10

mozilla/thunderbird < 78.10

Published Jun 24, 2021

Tracked Since Feb 18, 2026