CVE-2019-9793
5.9
MEDIUM
CVSS 3.1
EPSS 0.40%
Description
A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. *Note: Spectre mitigations are currently enabled for all users by default settings.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
How to fix CVE-2019-9793
To remediate CVE-2019-9793, upgrade the affected package to a fixed version below.
- —upgrade to 60.6.0esr-1 or later
- —upgrade to 1:60.6.1-1 or later
Is CVE-2019-9793 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 60.6.0esr-1
- from 0, < 1:60.6.1-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |