{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T11:05:37Z","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-sb220-lldp-multivuls-mVRUtQ8T","slug":"cisco-sa-sb220-lldp-multivuls-mvrutq8t","vendor":"Cisco","title":"Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities","summary":"Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business 220 Series Smart Switches. An unauthenticated, adjacent attacker could perform the following: Execute code on the affected device or cause it to reload unexpectedly Cause LLDP database corruption on the affected device For more information about these vulnerabilities, see the Details section of this advisory. Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released firmware updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","severity":"High","published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T/csaf/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T.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":6,"visible_product_count":3,"public_evidence_count":12,"kev_count":0,"highest_epss":0.00504},"cves":[{"id":"CVE-2021-34780","kev":false,"epss":{"score":0.00504,"percentile":0.39856,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},{"id":"CVE-2021-34779","kev":false,"epss":{"score":0.00504,"percentile":0.39856,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},{"id":"CVE-2021-34778","kev":false,"epss":{"score":0.00398,"percentile":0.32175,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},{"id":"CVE-2021-34777","kev":false,"epss":{"score":0.00398,"percentile":0.32175,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},{"id":"CVE-2021-34776","kev":false,"epss":{"score":0.00398,"percentile":0.32176,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},{"id":"CVE-2021-34775","kev":false,"epss":{"score":0.00398,"percentile":0.32176,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}}],"public_evidence":[{"product":{"name":"Cisco Small Business 200 Series Smart Switches","slug":"cisco-small-business-200-series-smart-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34780"},"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":"2026-07-20T04:56:07Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Small Business 200 Series Smart Switches","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":0.00504,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","advisory_updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T"},"row_display_order":1},{"product":{"name":"Cisco Small Business Smart and Managed Switches","slug":"cisco-small-business-smart-and-managed-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34780"},"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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exposure.","kev":false,"epss":{"score":0.00504,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","advisory_updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T"},"row_display_order":3},{"product":{"name":"Cisco Small Business Smart and Managed Switches","slug":"cisco-small-business-smart-and-managed-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34779"},"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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exposure.","kev":false,"epss":{"score":0.00504,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","advisory_updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T"},"row_display_order":4},{"product":{"name":"Cisco Small Business 200 Series Smart Switches","slug":"cisco-small-business-200-series-smart-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34778"},"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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exposure.","kev":false,"epss":{"score":0.00398,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","advisory_updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T"},"row_display_order":5},{"product":{"name":"Cisco Small Business Smart and Managed Switches","slug":"cisco-small-business-smart-and-managed-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34778"},"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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exposure.","kev":false,"epss":{"score":0.00398,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-10-06T23:00:00Z","updated_at":"2022-01-14T05:37:56Z","advisory_updated_at":"2022-01-14T05:37:56Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T"},"row_display_order":6},{"product":{"name":"Cisco Small Business 220 Series Smart Plus Switches","slug":"cisco-small-business-220-series-smart-plus-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34777"},"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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