Release Notes

Release Notes for the Cisco 1700 Series Routers for Cisco IOS Release 12.2(8)YL

OL-2941-03

Caveats

Caveats describe unexpected behavior or defects in Cisco IOS software releases. Severity 1 caveats are

the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious

of these three severity levels.

Caveats in Release 12.2 T are also in Release 12.2(8)YL1. For information on caveats in Cisco IOS

Release 12.2 T, refer to the Caveats for Cisco IOS Release 12.2 T document. For information on caveats

in Cisco IOS Release 12.2, refer to the Caveats for Cisco IOS Release 12.2 document. These documents

list severity 1 and 2 caveats, and are located on CCO and the Documentation CD.

Note If you have an account with Cisco.com, you can also use the Bug Toolkit to find select caveats of any

severity. To reach the Bug Toolkit, log in toCisco.com and click Service & Support: Technical

Assistance Center: Tool Index: Bug Toolkit. Another option is to go to

http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.

Resolved Caveats - Release 12.2(8)YL1

Cisco IOS Release 12.2(8)YL1 is a rebuild release for Cisco IOS Release 12.2(8)YL. This section

describes unexpected behavior that is fixed in Release 12.2(8)YL1.

Miscellaneous

CSCdz71127

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

http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml

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