Some classic Cisco IOS devices have a vulnerability in the PPP CHAP authentication to establish unauthorized PPP connections.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios | Cisco | 4.1 (including) | 4.1 (including) |
| Ios | Cisco | 9.1 (including) | 9.1 (including) |
| Ios | Cisco | 10.3 (including) | 10.3 (including) |
| Ios | Cisco | 11.0 (including) | 11.0 (including) |
| Ios | Cisco | 11.1 (including) | 11.1 (including) |
| Ios | Cisco | 11.2 (including) | 11.2 (including) |
| Ios | Cisco | 11.2p (including) | 11.2p (including) |