Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
| Software | From | Fixed in |
|---|---|---|
| putty / putty | - | 0.71 |
| fedoraproject / fedora | 28 | 28.x |
| fedoraproject / fedora | 29 | 29.x |
| debian / debian_linux | 8.0 | 8.0.x |
| debian / debian_linux | 9.0 | 9.0.x |
| opensuse / leap | 15.0 | 15.0.x |