CVE-2021-29946
8.8
HIGH
CVSS 3.1
EPSS 0.16%
Description
Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
How to fix CVE-2021-29946
To remediate CVE-2021-29946, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 78.10.0esr-1 or later
- —upgrade to 1:78.10.0-1 or later
Is CVE-2021-29946 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.10.0esr-1
- from 0, < 1:78.10.0-1
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 |