CVE-2021-43538
Medium
Description
By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
SeverityMedium
CVSS4.3
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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