{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T11:04:18Z","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-fxos-sbbp-XTuPkYTn","slug":"cisco-sa-fxos-sbbp-xtupkytn","vendor":"Cisco","title":"Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability","summary":"A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass the secure boot mechanisms.  The vulnerability is due to insufficient protections of the secure boot process. An attacker could exploit this vulnerability by injecting code into a specific file that is then referenced during the device boot process. A successful exploit could allow the attacker to break the chain of trust and inject code into the boot process of the device which would be executed at each boot and maintain persistence across reboots. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn","severity":"High","published_at":"2020-10-21T16:00:00Z","updated_at":"2020-10-21T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn/csaf/cisco-sa-fxos-sbbp-XTuPkYTn.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":2,"public_evidence_count":2,"kev_count":0,"highest_epss":0.00348},"cves":[{"id":"CVE-2020-3455","kev":false,"epss":{"score":0.00348,"percentile":0.27137,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"}}],"public_evidence":[{"product":{"name":"Cisco Firepower 4100 Series","slug":"cisco-firepower-4100-series","vendor":"Cisco"},"cve":{"id":"CVE-2020-3455"},"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":"2026-07-20T00:09:14Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Firepower Extensible Operating System (FXOS) 2.2.1.63 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.1.70 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.137 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.17 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.28 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.54 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.110 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.111 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.130 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.144 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.145 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.179 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.56 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.58 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.88 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.131 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.166 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.169 when installed on Cisco Firepower 4100 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.174 when installed on Cisco Firepower 4100 Series","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":0.00348,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"},"published_at":"2020-10-21T16:00:00Z","updated_at":"2020-10-21T16:00:00Z","advisory_updated_at":"2020-10-21T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn"},"row_display_order":1},{"product":{"name":"Cisco Firepower 9000 Series","slug":"cisco-firepower-9000-series","vendor":"Cisco"},"cve":{"id":"CVE-2020-3455"},"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":"2026-07-20T00:09:14Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Firepower Extensible Operating System (FXOS) 2.2.1.70 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.137 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.26 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.28 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.60 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.83 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.2.2.97 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.111 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.155 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.166 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.58 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.88 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.91 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.3.1.99 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.131 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.169 when installed on Cisco Firepower 9000 Series; Cisco Firepower Extensible Operating System (FXOS) 2.6.1.192 when installed on Cisco Firepower 9000 Series","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":0.00348,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"},"published_at":"2020-10-21T16:00:00Z","updated_at":"2020-10-21T16:00:00Z","advisory_updated_at":"2020-10-21T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTn"},"row_display_order":2}]}