CVE-2021-29945

MEDIUM

Firefox ESR <78.10 & Firefox <88 - Memory Corruption

Title source: llm
STIX 2.1

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)

Core 4
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-14/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-16/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-15/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1700690

Scores

CVSS v3 6.5
EPSS 0.0121
EPSS Percentile 64.3%
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