Cisco IOS contains a flaw that may allow a remote denial of service. The issue is triggered when refreshing the SSL VPN portal page via a clientless SSL VPN. This may allow a remote attacker to cause a loss of availability for the device.
Remote / Network Access
Denial of Service
Loss of Availability
Upgrade to version 15.1(2)T5 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.