Cisco Systems has fixed four denial-of-service vulnerabilities that attackers could exploit to cause Web Security Appliance devices to stop processing traffic correctly.

The Cisco Web Security Appliance (WSA) is a line of security devices that inspect Web traffic going in and out of an organization in order to detect malware, prevent data leaks and enforce Internet access policies for users and applications. The devices run an operating system called Cisco AsyncOS.

One of the four DoS vulnerabilities fixed Wednesday by Cisco stems from how the OS handles a specific HTTP response code. An attacker could send a specifically crafted HTTP request to consume the entire memory of an affected device.

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