Successful exploitation of the vulnerability may result in a memory leak that can lead to a denial of service condition. Memory exhaustion can cause an affected Cisco IOS device to reload or become unresponsive; a power cycle might be required to recover from the condition.
.Vulnerable Systems:
*Cisco IOS devices with the DLSw promiscuous feature
Memory leak in the Data-link switching (aka DLSw) feature in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xS before 3.1.3S and 3.2.xS before 3.2.1S, when implemented over Fast Sequence Transport (FST), allows remote attackers to cause a denial of service (memory consumption and device reload or hang) via a crafted IP protocol 91 packet, aka Bug ID CSCth69364.
Vendor Status:
Cisco has issued an update to correct this vulnerability