| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 99.0 | 99.0 |
| firefox esr | < 91.8 | 91.8 |
| thunderbird | < 91.8 | 91.8 |
If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.
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