Rule Category

PROTOCOL-VOIP -- Snort has detected traffic that may indicate the presence of the VOIP protocol or vulnerabilities in the VOIP protocol on the network.

Alert Message

PROTOCOL-VOIP SIP wildcard VIA address flood attempt

Rule Explanation

This event is generated when a SIP wildcard VIA address flood attacks an internal VOIP device. Impact: Attempted Denial of Service Details: A vulnerability in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload or trigger high CPU, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of SIP traffic. An attacker could exploit this vulnerability by sending SIP requests designed to specifically trigger this issue at a high rate across an affected device. Ease of Attack:

What To Look For

No information provided

Known Usage

No public information

False Positives

No known false positives


Cisco Talos Intelligence Group

Rule Groups

No rule groups


Additional Links

Rule Vulnerability

CVE Additional Information

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