CVE-2021-43534
High
Description
Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. 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 Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedDec 8, 2021
First seenDec 8, 2021
How to fix
Update
- mozilla firefox94.0 or later
- mozilla firefox_esr91.3.0 or later
- mozilla thunderbird91.3.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 94.0 | 94.0 |
| mozilla firefox_esr | v < 91.3.0 | 91.3.0 |
| mozilla thunderbird | v < 91.3.0 | 91.3.0 |
| debian debian_linux | 9.0, 10.0, 11.0 | — |
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