CVE-2021-29984
8.8
HIGH
CVSS 3.1
EPSS 0.45%
Description
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
How to fix CVE-2021-29984
To remediate CVE-2021-29984, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 78.13.0esr-1~deb11u1 or later
- —upgrade to 1:78.13.0-1~deb11u1 or later
Is CVE-2021-29984 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.13.0esr-1~deb11u1
- from 0, < 1:78.13.0-1~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 |