Cisco Outbound Access Control List Bypass Vulnerability

Cisco IOS is the router firmware included with numerous devices manufactured by Cisco Systems.

IOS on Cisco 1200 series routers with Engine 2 based cards may fail to block intended traffic using outbound ACLs. This may be the case when input ACL is configured on some, but not all, of the interfaces on the card. This vulnerability will occur only when the packets in question are not blocked by an inbound ACL on the ingress port.

An ACL applied to incoming packets will still behave as expected.


 

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