CVE-2019-11759
High
Description
An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedJan 8, 2020
First seenJan 8, 2020
How to fix
Update
- mozilla firefox70.0 or later
- mozilla firefox_esr68.2 or later
- mozilla thunderbird68.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 70.0 | 70.0 |
| mozilla firefox_esr | v < 68.2 | 68.2 |
| mozilla thunderbird | v < 68.2 | 68.2 |
| canonical ubuntu_linux | 16.04 | — |
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