CVE-2021-43539
High
Description
Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedDec 8, 2021
First seenDec 8, 2021
How to fix
Update
- mozilla firefox95.0 or later
- mozilla firefox_esr91.4.0 or later
- mozilla thunderbird91.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 95.0 | 95.0 |
| mozilla firefox_esr | v < 91.4.0 | 91.4.0 |
| mozilla thunderbird | v < 91.4.0 | 91.4.0 |
| debian debian_linux | 9.0, 10.0, 11.0 | — |
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