{"api_version":"1","generated_at":"2026-08-15T22:28:32+00:00","cve":"CVE-2026-20301","urls":{"html":"https://cve.report/CVE-2026-20301","api":"https://cve.report/api/cve/CVE-2026-20301.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20301","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20301"},"summary":{"title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability","description":"A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-08-05 17:16:50","updated_at":"2026-08-06 15:44:56"},"problem_types":["CWE-606","CWE-606 Unchecked Input for Loop 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20301","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 17.2.1a","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.12.1y","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.12.3s","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.7.1b","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.6.2","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.6.5","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 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vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability."}],"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-606","description":"Unchecked Input for Loop Condition","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-08-05T16:28:37.635Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-ios-xmcp-thbAr34t","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"}],"source":{"advisory":"cisco-sa-ios-xmcp-thbAr34t","defects":["CSCwu20827"],"discovery":"INTERNAL"},"title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20301","datePublished":"2026-08-05T16:28:37.635Z","dateReserved":"2025-10-08T11:59:15.408Z","dateUpdated":"2026-08-05T17:45:13.376Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-05 17:16:50","lastModifiedDate":"2026-08-06 15:44:56","problem_types":["CWE-606","CWE-606 Unchecked Input for Loop Condition"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-05T17:35:10.643585Z","id":"CVE-2026-20301","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20301","Ordinal":"1","Title":"Cisco IOS Software and IOS XE Software Extensible Messaging Clie","CVE":"CVE-2026-20301","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20301","Ordinal":"1","NoteData":"A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability.","Type":"Description","Title":"Cisco IOS Software and IOS XE Software Extensible Messaging Clie"}]}}}