CVE-2021-38496
thunderbird - security update
8.8
HIGH
CVSS 3.1
EPSS 1.1%
Description
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
How to fix CVE-2021-38496
To remediate CVE-2021-38496, upgrade the affected package to a fixed version below.
- —upgrade to 78.15.0esr-1~deb11u1 or later
- —upgrade to 78.15.0esr-1~deb9u1 or later
- —upgrade to 78.15.0esr-1~deb10u1 or later
- —upgrade to 1:91.4.1-1~deb11u1 or later
- —upgrade to 1:91.4.1-1~deb9u1 or later
- —upgrade to 1:91.4.1-1~deb10u1 or later
Is CVE-2021-38496 being exploited?
Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 78.15.0esr-1~deb11u1
- from 0, < 78.15.0esr-1~deb9u1
- from 0, < 78.15.0esr-1~deb10u1
- from 0, < 1:91.4.1-1~deb11u1
- from 0, < 1:91.4.1-1~deb9u1
- from 0, < 1:91.4.1-1~deb10u1
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 |