{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T10:13:56Z","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","advisory":{"id":"cisco-sa-20040420-tcp-ios","slug":"cisco-sa-20040420-tcp-ios","vendor":"Cisco","title":"TCP Vulnerabilities in Multiple IOS-Based Cisco Products","summary":"A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been discovered by an external researcher. The successful exploitation enables an adversary to reset any established TCP connection in a much shorter time than was previously discussed publicly. Depending on the application, the connection may get automatically re-established. In other cases, a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending upon the attacked protocol, a successful attack may have additional consequences beyond terminated connection which must be considered. This attack vector is only applicable to the sessions which are terminating on a device (such as a router, switch, or computer) and not to the sessions that are only passing through the device (for example, transit traffic that is being routed by a router). In addition, this attack vector does not directly compromise data integrity or confidentiality. All Cisco products which contain a TCP stack are susceptible to this vulnerability. This advisory is available at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios, and it describes this vulnerability as it applies to Cisco products that run Cisco IOS�� software. A companion advisory that describes this vulnerability for products that do not run Cisco IOS software is available at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-nonios.","severity":"NA","published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios/csaf/cisco-sa-20040420-tcp-ios.json","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure."},"freshness":{"last_source_refreshed_at":"2026-07-21T05:16:34Z","latest_source_refresh_at":"2026-07-21T05:16:34Z","oldest_source_refresh_at":"2026-07-21T03:00:03Z","all_sources_fresh":true,"sources":[{"source":"cisco_advisories","label":"Cisco advisories","last_success_at":"2026-07-21T03:00:03Z","stale":false},{"source":"cisco_csaf","label":"Cisco CSAF","last_success_at":"2026-07-21T05:14:24Z","stale":false},{"source":"nvd_cves","label":"NVD CVEs","last_success_at":"2026-07-21T05:16:30Z","stale":false},{"source":"cisa_kev","label":"CISA KEV","last_success_at":"2026-07-21T05:16:31Z","stale":false},{"source":"first_epss","label":"EPSS","last_success_at":"2026-07-21T05:16:34Z","stale":false}]},"summary":{"cve_count":1,"visible_product_count":29,"public_evidence_count":29,"kev_count":0,"highest_epss":0.80286},"cves":[{"id":"CVE-2004-0230","kev":false,"epss":{"score":0.80286,"percentile":0.99578,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"}}],"public_evidence":[{"product":{"name":"Cisco Cache Engine","slug":"cisco-cache-engine","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Cache Engine","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":1},{"product":{"name":"Cisco Catalyst 1900/2820","slug":"cisco-catalyst-1900-2820","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Catalyst 1900/2820","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":2},{"product":{"name":"Cisco Unified Communications Manager","slug":"cisco-unified-communications-manager","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Unified Communications Manager","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":3},{"product":{"name":"Cisco GSS Global Site Selector","slug":"cisco-gss-global-site-selector","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known 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(ICM)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":5},{"product":{"name":"Cisco Secure Access Control Server (ACS) for Windows","slug":"cisco-secure-access-control-server-acs-for-windows","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product 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exposure.","kev":false,"epss":{"score":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":6},{"product":{"name":"CiscoWorks Hosting Solution Engine (HSE)","slug":"ciscoworks-hosting-solution-engine-hse","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"CiscoWorks Hosting Solution Engine (HSE)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":7},{"product":{"name":"CiscoWorks Wireless LAN Solution Engine (WLSE)","slug":"ciscoworks-wireless-lan-solution-engine-wlse","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known 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exposure.","kev":false,"epss":{"score":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":8},{"product":{"name":"Cisco Content Distribution Manager (CDM)","slug":"cisco-content-distribution-manager-cdm","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Content Distribution Manager (CDM)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":9},{"product":{"name":"Cisco Content Engine","slug":"cisco-content-engine","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco 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exposure.","kev":false,"epss":{"score":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":10},{"product":{"name":"Cisco Content Router","slug":"cisco-content-router","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Content Router","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":11},{"product":{"name":"Cisco Content Services Switch (CSS)","slug":"cisco-content-services-switch-css","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Content Services Switch (CSS)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":12},{"product":{"name":"Cisco Content Switching Module (CSM)","slug":"cisco-content-switching-module-csm","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Content Switching Module (CSM)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":13},{"product":{"name":"Cisco Element Management Framework (Cisco EMF)","slug":"cisco-element-management-framework-cisco-emf","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Element Management Framework (Cisco EMF)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":14},{"product":{"name":"Cisco Firewall Services Module (FWSM)","slug":"cisco-firewall-services-module-fwsm","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known 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exposure.","kev":false,"epss":{"score":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":15},{"product":{"name":"Cisco Intrusion Detection System (IDS)","slug":"cisco-intrusion-detection-system-ids","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"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":"2026-07-19T23:40:06Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Intrusion Detection System (IDS)","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":0.80286,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:32Z"},"published_at":"2004-04-21T04:00:00Z","updated_at":"2004-04-21T04:00:00Z","advisory_updated_at":"2004-04-21T04:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040420-tcp-ios","row_display_order":16},{"product":{"name":"Cisco IP phone","slug":"cisco-ip-phone","vendor":"Cisco"},"cve":{"id":"CVE-2004-0230"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco 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