The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox < 68.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox | - | 68.0 |
| opensuse / leap | 15.0 | 15.0.x |
| opensuse / leap | 15.1 | 15.1.x |