CVE-2021-38500: Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1

Description

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

Required

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)1.3% · higher than 70% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

FI

Firefox · Mozilla

before 93.0; 91.0 before 91.2 · source: NVD

DL

Debian Linux · Debian

9.0; 10.0; 11.0 · source: NVD

FE

Firefox Esr · Mozilla

before 78.15 · source: NVD

TH

Thunderbird · Mozilla

before 78.15; 91.0 before 91.2 · source: NVD