CVE-2021-23987
8.8
HIGH
CVSS 3.1
EPSS 0.39%
Description
Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
How to fix CVE-2021-23987
To remediate CVE-2021-23987, upgrade the affected package to a fixed version below.
- —upgrade to 78.9.0esr-1 or later
- —upgrade to 1:78.9.0-1 or later
Is CVE-2021-23987 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.9.0esr-1
- from 0, < 1:78.9.0-1
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 |