The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios | Cisco | 12.1(19) (including) | 12.1(19) (including) |