VAR-200112-0005

Vulnerability from variot - Updated: 2025-04-03 22:16

Cisco 12000 with IOS 12.0 and line cards based on Engine 2 does not properly filter does not properly filter packet fragments even when the "fragment" keyword is used in an ACL, which allows remote attackers to bypass the intended access controls. Cisco IOS is the router firmware included with numerous devices manufactured by Cisco Systems. IOS on Cisco 12000 series routers with Engine 2 based cards may fail to block intended traffic using outgoing ACLs. Outgoing ACL lists do not support the keyword 'fragment', and will ignore it. If the keyword is included in the ACL, fragmented packets will not be evaluated against the associated rules, possibly bypassing security policy

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