CVE-2023-6858
High
Description
Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedDec 19, 2023
First seenDec 19, 2023
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- mozilla firefox121.0 or later
- mozilla firefox_esr115.6 or later
- mozilla thunderbird115.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 121.0 | 121.0 |
| mozilla firefox_esr | v < 115.6 | 115.6 |
| mozilla thunderbird | v < 115.6 | 115.6 |
| debian debian_linux | 10.0, 11.0, 12.0 | — |
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