CVE-2021-29976
8.8
HIGH
CVSS 3.1
EPSS 0.57%
Description
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 < 78.12, Firefox ESR < 78.12, and Firefox < 90.
How to fix CVE-2021-29976
To remediate CVE-2021-29976, upgrade the affected package to a fixed version below.
- —upgrade to 78.12.0esr-1 or later
- —upgrade to 1:78.12.0-1 or later
Is CVE-2021-29976 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.12.0esr-1
- from 0, < 1:78.12.0-1
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 |