Cisco Cisco IOS Software Release 12.2

Cisco IOS Release 12.2(7g) is a rebuild release for Cisco IOS Release 12.2(7). The caveats in this 
section are resolved in Cisco IOS Release 12.2(7g) but may be open in previous Cisco IOS releases.

CSCea02355

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 IOS Release 12.2(7e) is a rebuild release for Cisco IOS Release 12.2(7). The caveats in this section 
are resolved in Cisco IOS Release 12.2(7e) but may be open in previous Cisco IOS releases.

The following information is provided for each caveat:

Symptoms—A description of what is observed when the caveat occurs. 

Conditions—The conditions under which the caveat has been known to occur. 

Workaround—Solutions, if available, to counteract the caveat. 

CSCdx14794

A modem call does not send data after the data send ready (DSR) signal comes up on the 

modem. 

This symptom is observed on a Cisco AS5800 universal access server that has a 

Cisco AS5800 series 324-port card that has a Cisco NextPort modem. The client side may keep 
sending PPP and Link Control Protocol (LCP) frames until a timeout occurs. 

There is no workaround. 

CSCdx20135

A router may display a “%RADIUS-3-ALLDEADSERVER” error message on the 

console. 

This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2 T 

even if the radius-server deadtime global configuration command is not configured. 

There is no workaround.