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Cisco Systems has released patches to fix serious denial-of-service flaws in its Wireless LAN Controller (WLC) software, Cisco Adaptive Security Appliance (ASA) software and the Secure Real-Time Transport Protocol (SRTP) library that's used in many products.

The Cisco WLC software contains two denial-of-service vulnerabilities, one of which is rated critical and could be exploited by an unauthenticated attacker through specially crafted HTTP requests sent to the device. This can cause a buffer overflow condition that, in addition to a device reload, might also allow for execution of arbitrary code on the device.

The second vulnerability, rated high, stems from how the Cisco WLC software handles Bonjour traffic and can be exploited in a similar manner as the HTTP one to cause a device reload.

A third DoS vulnerability was patched in the Cisco AireOS software that also runs on some of the company's Wireless LAN Controller devices. It can be exploited by an unauthenticated hacker by attempting to access a URL that is not generally accessible from and supported by the device's management interface.

The software, used in the Cisco ASA 5500-X Series Next-Generation Firewalls, Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers and the Cisco Adaptive Security Virtual Appliance (ASAv), has a flaw stemming from an insufficient validation of DHCPv6 packets.