Cisco IOS 2.2(18)EW, 12.2(18)EWA, 12.2(14)SZ, 12.2(18)S, 12.2(18)SE, 12.2(18)SV, 12.2(18)SW, and other versions without the no service dhcp command, keep undeliverable DHCP packets in the queue instead of dropping them, which allows remote attackers to cause a denial of service (dropped traffic) via multiple undeliverable DHCP packets that exceed the input queue size.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios | Cisco | 12.2(14)sz (including) | 12.2(14)sz (including) |
| Ios | Cisco | 12.2(18)ew (including) | 12.2(18)ew (including) |
| Ios | Cisco | 12.2(18)ewa (including) | 12.2(18)ewa (including) |
| Ios | Cisco | 12.2(18)s (including) | 12.2(18)s (including) |
| Ios | Cisco | 12.2(18)se (including) | 12.2(18)se (including) |
| Ios | Cisco | 12.2(18)sv (including) | 12.2(18)sv (including) |
| Ios | Cisco | 12.2(18)sw (including) | 12.2(18)sw (including) |
| Ios | Cisco | 12.2(20)ew (including) | 12.2(20)ew (including) |