CVE-2021-43535
High
Description
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, 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 firefox93.0 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 < 93.0 | 93.0 |
| 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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