{"id":"CVE-2020-3511","state":"PUBLISHED","title":"Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability","description":"A vulnerability in the ISDN subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient input validation when the ISDN Q.931 messages are processed. An attacker could exploit this vulnerability by sending a malicious ISDN Q.931 message to an affected device. 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