{"id":"CVE-2023-20033","title":"Cisco IOS XE Software for Catalyst 3650 and Catalyst 3850 Switches Denial of Service  Vulnerability","summary":"A vulnerability in Cisco IOS XE Software for Cisco Catalyst 3650 and Catalyst 3850 Series Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) c…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cvssSource":"vendor","vendor":"Cisco","product":"Cisco IOS XE Software","affected":["ios_xe_software 16.3.1","ios_xe_software 16.4.1","ios_xe_software 16.3.2","ios_xe_software 16.3.3","ios_xe_software 16.5.1","ios_xe_software 16.6.1","ios_xe_software 16.7.1","ios_xe_software 16.8.1","ios_xe_software 16.3.1a","ios_xe_software 16.3.4","ios_xe_software 16.5.1a","ios_xe_software 16.9.1","ios_xe_software 16.11.1","ios_xe_software 16.12.1","ios_xe_software 16.6.2","ios_xe_software 16.3.5","ios_xe_software 16.3.5b","ios_xe_software 16.3.6","ios_xe_software 16.6.3","ios_xe_software 16.9.2","ios_xe_software 16.6.4","ios_xe_software 16.8.1a","ios_xe_software 16.8.1s","ios_xe_software 16.3.7","ios_xe_software 16.6.5","ios_xe_software 16.9.1s","ios_xe_software 16.6.4s","ios_xe_software 16.6.4a","ios_xe_software 16.9.3","ios_xe_software 16.3.8","ios_xe_software 16.9.2s","ios_xe_software 16.6.6","ios_xe_software 16.6.7","ios_xe_software 16.11.1s","ios_xe_software 16.3.9","ios_xe_software 16.9.4","ios_xe_software 16.9.3s","ios_xe_software 16.9.3a","ios_xe_software 16.11.1c","ios_xe_software 16.12.1s"],"published":"2023-09-27","updated":"2023-09-27","sourceUpdated":"2023-09-27T16:00:00+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat3k-dos-ZZA4Gb3r","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat3k-dos-ZZA4Gb3r"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.00653,"epssPercentile":0.495,"ingestedAt":"2026-09-08T15:58:18.536Z","slug":"CVE-2023-20033","body":"## Overview\n\nA vulnerability in Cisco IOS XE Software for Cisco Catalyst 3650 and Catalyst 3850 Series Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper resource management when processing traffic that is received on the management interface. An attacker could exploit this vulnerability by sending a high rate of traffic to the management interface. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the September 2023 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74916\"].\n\n## Vendor advisories\n\n- **cisco-sa-cat3k-dos-ZZA4Gb3r** · Cisco · affected: Cisco IOS XE Software (63 versions) · updated 2023-09-27 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat3k-dos-ZZA4Gb3r)\n\n**Cisco IOS XE Software for Catalyst 3650 and Catalyst 3850 Series Switches Denial of Service Vulnerability**. Released 2023-09-27.\n\nAffected:\n\n- Cisco IOS XE Software 16.3.1\n- Cisco IOS XE Software 16.4.1\n- Cisco IOS XE Software 16.3.2\n- Cisco IOS XE Software 16.3.3\n- Cisco IOS XE Software 16.5.1\n- Cisco IOS XE Software 16.6.1\n- Cisco IOS XE Software 16.7.1\n- Cisco IOS XE Software 16.8.1\n- Cisco IOS XE Software 16.3.1a\n- Cisco IOS XE Software 16.3.4\n- Cisco IOS XE Software 16.5.1a\n- Cisco IOS XE Software 16.9.1\n- Cisco IOS XE Software 16.11.1\n- Cisco IOS XE Software 16.12.1\n- Cisco IOS XE Software 16.6.2\n- Cisco IOS XE Software 16.3.5\n- Cisco IOS XE Software 16.3.5b\n- Cisco IOS XE Software 16.3.6\n- Cisco IOS XE Software 16.6.3\n- Cisco IOS XE Software 16.9.2\n- Cisco IOS XE Software 16.6.4\n- Cisco IOS XE Software 16.8.1a\n- Cisco IOS XE Software 16.8.1s\n- Cisco IOS XE Software 16.3.7\n- Cisco IOS XE Software 16.6.5\n- Cisco IOS XE Software 16.9.1s\n- Cisco IOS XE Software 16.6.4s\n- Cisco IOS XE Software 16.6.4a\n- Cisco IOS XE Software 16.9.3\n- Cisco IOS XE Software 16.3.8\n- Cisco IOS XE Software 16.9.2s\n- Cisco IOS XE Software 16.6.6\n- Cisco IOS XE Software 16.6.7\n- Cisco IOS XE Software 16.11.1s\n- Cisco IOS XE Software 16.3.9\n- Cisco IOS XE Software 16.9.4\n- Cisco IOS XE Software 16.9.3s\n- Cisco IOS XE Software 16.9.3a\n- Cisco IOS XE Software 16.11.1c\n- Cisco IOS XE Software 16.12.1s\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}