Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Putty | Putty | * | 0.71 (excluding) |
| Putty | Ubuntu | bionic | * |
| Putty | Ubuntu | cosmic | * |
| Putty | Ubuntu | esm-apps/xenial | * |
| Putty | Ubuntu | trusty | * |
| Putty | Ubuntu | upstream | * |
| Putty | Ubuntu | xenial | * |