CVE-2020-26959
8.8
HIGH
CVSS 3.1
EPSS 0.44%
Description
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
How to fix CVE-2020-26959
To remediate CVE-2020-26959, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 78.5.0esr-1 or later
- —upgrade to 1:78.5.0-1 or later
Is CVE-2020-26959 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.5.0esr-1
- from 0, < 1:78.5.0-1
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 |