{"id":"CVE-2026-20177","state":"PUBLISHED","title":"Cisco Industrial Ethernet 1000 Series Switches Denial of Service Vulnerability","description":"A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected.","publishedAt":"2026-08-19T16:16:50.507Z","updatedAt":"2026-08-20T15:57:08.771Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Industrial Ethernet Switches"],"affected":[{"vendor":"Cisco","product":"Cisco Industrial Ethernet Switches","defaultStatus":"unknown","versions":[{"version":"1.1","status":"affected"},{"version":"1.2","status":"affected"},{"version":"1.8.0","status":"affected"},{"version":"1.8.2","status":"affected"},{"version":"1.7.0","status":"affected"},{"version":"1.3","status":"affected"},{"version":"1.9.1","status":"affected"},{"version":"1.6","status":"affected"},{"version":"1.8.1","status":"affected"},{"version":"1.9.2","status":"affected"},{"version":"1.9.2a","status":"affected"},{"version":"1.9.3","status":"affected"},{"version":"1.9.4","status":"affected"},{"version":"1.9.5","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ie1k-uxq86Lnx"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20177.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20177","state":"PUBLISHED","datePublished":"2026-08-19T16:16:50.507Z","dateUpdated":"2026-08-20T15:57:08.771Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.392Z"},"containers":{"cna":{"title":"Cisco Industrial Ethernet 1000 Series Switches Denial of Service Vulnerability","descriptions":[{"lang":"en","value":"A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected."}],"affected":[{"vendor":"Cisco","product":"Cisco Industrial Ethernet Switches","defaultStatus":"unknown","versions":[{"version":"1.1","status":"affected"},{"version":"1.2","status":"affected"},{"version":"1.8.0","status":"affected"},{"version":"1.8.2","status":"affected"},{"version":"1.7.0","status":"affected"},{"version":"1.3","status":"affected"},{"version":"1.9.1","status":"affected"},{"version":"1.6","status":"affected"},{"version":"1.8.1","status":"affected"},{"version":"1.9.2","status":"affected"},{"version":"1.9.2a","status":"affected"},{"version":"1.9.3","status":"affected"},{"version":"1.9.4","status":"affected"},{"version":"1.9.5","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ie1k-uxq86Lnx","name":"cisco-sa-ie1k-uxq86Lnx"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"Allocation of Resources Without Limits or Throttling","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-08-19T16:16:50.507Z"},"exploits":[{"lang":"en","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"source":{"advisory":"cisco-sa-ie1k-uxq86Lnx","discovery":"INTERNAL","defects":["CSCwp27607"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-20177","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-08-20T15:39:52.842587Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-20T15:57:08.771Z"}}]}}}