Only the Cisco devices running IOS and configured for IPv6 are
affected. A router will display all IPv6 enabled interfaces with the
show ipv6 interface command.
An empty output or an error message will be displayed if IPv6 is
disabled or unsupported on the system. In this case the system is
Sample output of show ipv6 interface command
is shown below for a system configured for IPv6.
Router#show ipv6 interface
Serial1/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:D200
Global unicast address(es):
2001:1:33::3, subnet is 2001:1:33::/64 [TENTATIVE]
Joined group address(es):
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds
A router that has IPv6 enabled on a physical or logical interface is
vulnerable to this issue even if ipv6
unicast-routing is globally disabled. The show ipv6
interface command can be used to determine whether IPv6 is
enabled on any interface.
Products that are not running Cisco IOS are not affected.
Products running any version of Cisco IOS that do not have IPv6
configured interfaces are not vulnerable.
No other Cisco products are currently known to be affected by these