CVE-2021-38500
8.8
HIGH
CVSS 3.1
EPSS 1.1%
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.
How to fix CVE-2021-38500
To remediate CVE-2021-38500, upgrade the affected package to a fixed version below.
- —upgrade to 78.15.0esr-1~deb11u1 or later
- —upgrade to 1:91.4.1-1~deb11u1 or later
Is CVE-2021-38500 being exploited?
Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.15.0esr-1~deb11u1
- from 0, < 1:91.4.1-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |