CVE-2021-29976
High
Description
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedAug 5, 2021
First seenAug 5, 2021
How to fix
Update
- mozilla firefox90.0 or later
- mozilla firefox_esr78.12 or later
- mozilla thunderbird78.12 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 90.0 | 90.0 |
| mozilla firefox_esr | v < 78.12 | 78.12 |
| mozilla thunderbird | v < 78.12 | 78.12 |
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