CVE-2021-23960
High
Description
Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedFeb 26, 2021
First seenFeb 26, 2021
How to fix
Update
- mozilla firefox85.0 or later
- mozilla firefox_esr78.7 or later
- mozilla thunderbird78.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 85.0 | 85.0 |
| mozilla firefox_esr | v < 78.7 | 78.7 |
| mozilla thunderbird | v < 78.7 | 78.7 |
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