Cisco Cisco IOS Software Release 12.2(13)ZF

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Cisco IOS Release 12.2(13)ZF2 is a rebuild release for Cisco IOS Release 12.2(13)ZF. This section 
describes unexpected behavior that is fixed in Release 12.2(13)ZF2.

Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol 
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of crafted 
IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the 
input queue is full. No authentication is required to process the inbound packet. Processing of IPv4 
packets is enabled by default. Devices running only IP version 6 (IPv6) are not affected. A workaround 
is available.

Cisco has made software available, free of charge, to correct the problem.

This advisory is available at

Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol 
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of crafted 
IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the 
input queue is full. No authentication is required to process the inbound packet. Processing of IPv4 
packets is enabled by default. Devices running only IP version 6 (IPv6) are not affected. A workaround 
is available.

Cisco has made software available, free of charge, to correct the problem.

This advisory is available at

The following sections lists the open caveats for the Cisco IOS release 12.2(13)ZF.

The throughput of the tx-ring size 1 feature on the Cisco 1700 router XDSL interface decreases when 
the pack latency is reduced.