{"schema_version":"public-product-v1.1","generated_at":"2026-08-10T11:44:04Z","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","cve":{"id":"CVE-2026-20301","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.","severity":"HIGH","kev":false,"epss":{"score":0.00327,"percentile":0.25257,"score_date":"2026-08-09","updated_at":"2026-08-10T05:36:57Z"},"cvss_score":8.6,"cvss_source":"NVD","cwe":"CWE-606","published_at":"2026-08-05T17:16:50Z","modified_at":"2026-08-06T15:44:56Z"},"freshness":{"last_source_refreshed_at":"2026-08-10T05:36:57Z","latest_source_refresh_at":"2026-08-10T05:36:57Z","oldest_source_refresh_at":"2026-08-10T03:00:02Z","all_sources_fresh":true,"sources":[{"source":"cisco_advisories","label":"Cisco advisories","last_success_at":"2026-08-10T03:00:02Z","stale":false},{"source":"cisco_csaf","label":"Cisco CSAF","last_success_at":"2026-08-10T05:34:32Z","stale":false},{"source":"nvd_cves","label":"NVD CVEs","last_success_at":"2026-08-10T05:36:54Z","stale":false},{"source":"cisa_kev","label":"CISA KEV","last_success_at":"2026-08-10T05:36:54Z","stale":false},{"source":"first_epss","label":"EPSS","last_success_at":"2026-08-10T05:36:57Z","stale":false}]},"summary":{"advisory_count":2,"visible_product_count":4,"public_evidence_count":4,"kev":false,"cvss_score":8.6},"advisories":[{"id":"cisco-sa-ios-xmcp-thbAr34t","slug":"cisco-sa-ios-xmcp-thbar34t","title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},{"id":"cisco-sa-notice-L4XfJg8S","slug":"cisco-sa-notice-l4xfjg8s","title":"Cisco Advance Notification for Publication of August 5, 2026, Security Advisories","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-L4XfJg8S"}],"public_evidence":[{"product":{"name":"Cisco IOS","slug":"cisco-ios","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-xmcp-thbAr34t","slug":"cisco-sa-ios-xmcp-thbar34t","title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-08-06T04:00:28Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"12.2(6)I1; 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15.8(3)M5; 15.8(3)M6; 15.8(3)M7; 15.8(3)M8; 15.8(3)M9; 15.9(3)M; 15.9(3)M0a; 15.9(3)M1; 15.9(3)M10; 15.9(3)M11; 15.9(3)M12; 15.9(3)M13; 15.9(3)M14; 15.9(3)M2; 15.9(3)M2a; 15.9(3)M3; 15.9(3)M3a; 15.9(3)M3b; 15.9(3)M4; 15.9(3)M4a; 15.9(3)M5; 15.9(3)M6; 15.9(3)M6a; 15.9(3)M6b; 15.9(3)M7; 15.9(3)M7a; 15.9(3)M8; 15.9(3)M8a; 15.9(3)M8b; 15.9(3)M9; 15.9(3)M9a","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00327,"score_date":"2026-08-09","updated_at":"2026-08-10T05:36:57Z"},"cvss_score":8.6,"cvss_source":"NVD","published_at":"2026-08-05T16:00:00Z","updated_at":"2026-08-05T16:00:00Z","advisory_updated_at":"2026-08-05T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"row_display_order":1},{"product":{"name":"Cisco IOS XE Software","slug":"cisco-ios-xe-software","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-xmcp-thbAr34t","slug":"cisco-sa-ios-xmcp-thbar34t","title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-08-06T04:00:28Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"16.10.1a; 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16.10.2; 16.10.3; 16.11.1a; 16.11.1b; 16.12.3; 16.12.4; 16.12.4a; 16.12.5; 16.9.1; 16.9.2; 16.9.3; 16.9.4; 17.6.4","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00327,"score_date":"2026-08-09","updated_at":"2026-08-10T05:36:57Z"},"cvss_score":8.6,"cvss_source":"NVD","published_at":"2026-08-05T16:00:00Z","updated_at":"2026-08-05T16:00:00Z","advisory_updated_at":"2026-08-05T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"row_display_order":3},{"product":{"name":"Cisco Catalyst SD-WAN Controller","slug":"cisco-catalyst-sd-wan-controller","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-xmcp-thbAr34t","slug":"cisco-sa-ios-xmcp-thbar34t","title":"Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-08-06T04:00:28Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"26.1.1","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00327,"score_date":"2026-08-09","updated_at":"2026-08-10T05:36:57Z"},"cvss_score":8.6,"cvss_source":"NVD","published_at":"2026-08-05T16:00:00Z","updated_at":"2026-08-05T16:00:00Z","advisory_updated_at":"2026-08-05T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t"},"row_display_order":4}]}