{"id":"CVE-2020-3511","published":"2020-09-24T17:51:39Z","modified":"2024-11-13T18:00:40Z","title":"Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability","vendor":"Cisco","product":"Cisco IOS","tier":"tail","description":{"text":"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. A successful exploit could allow the attacker to cause the process to crash, resulting in a reload of the affected device.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.4,"severity":"HIGH","version":"3.0","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00433,"percentile":0.37532,"provenance":"source"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-isdn-q931-dos-67eUZBTf","tags":["vendor-advisory","x_refsource_CISCO"]}],"priority":{"score":12.7,"factors":[{"name":"EPSS percentile","points":7.51},{"name":"CVSS severity","points":5.18}]},"vendorSlug":"cisco","euvd":{"id":"EUVD-2020-24782","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-cisco-ios-cwe-20"}}