CVE-2021-38504

HIGH

Firefox < 94, Thunderbird < 91.3, Firefox ESR < 91.3 - Use After Free

Title source: llm
STIX 2.1

Description

When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

References (10)

Core 10
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1730156
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-5026
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2022/dsa-5034
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202202-03
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202208-14

Scores

CVSS v3 8.8
EPSS 0.0130
EPSS Percentile 80.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (6)
debian/debian_linux 9.0
debian/debian_linux 10.0
debian/debian_linux 11.0
mozilla/firefox < 94.0
mozilla/firefox_esr < 91.3.0
mozilla/thunderbird < 91.3.0
Published Dec 08, 2021
Tracked Since Feb 18, 2026