CVE-2019-17023
Medium
Description
After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox < 72.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mozilla Firefox
PublishedJan 8, 2020
First seenJan 8, 2020
How to fix
Update
- mozilla firefox72.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 72.0 | 72.0 |
| canonical ubuntu_linux | 16.04, 18.04, 19.04, 19.10, 20.04 | — |
| debian debian_linux | 10.0 | — |
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