CVE-2021-29982

MEDIUM

Firefox <91 - Info Disclosure

Title source: llm

Description

Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.

References (4)

[Exploit, Issue Tracking, Vendor Advisory] https://bugzilla.mozilla.org/show_bug.cgi?id=1715318

[Third Party Advisory] https://security.gentoo.org/glsa/202202-03

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2021-33/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2021-36/

Scores

CVSS v3 6.5

EPSS 0.0038

EPSS Percentile 59.2%

Attack Vector NETWORK

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

Classification

CWE

CWE-772

Status published

Affected Products (2)

mozilla/firefox < 91.0

mozilla/thunderbird < 91.0

Timeline

Published Aug 17, 2021

Tracked Since Feb 18, 2026