{"cve":{"cve_id":"CVE-2026-73437","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00207,"epss_percentile":0.10086,"epss_as_of":"2026-10-15","description":"On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper address, and the relay agent would forward it to clients without validating the source. This could allow the attacker to supply clients with malicious network configuration parameters, potentially resulting in traffic interception or denial of service for affected clients.","published_at":"2026-09-15T21:02:49.314000Z","last_modified_at":"2026-09-17T04:17:57.743000Z","cvss_v3_score":9.6,"cvss_v3_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":6.5,"cvss_v4_vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H","cvss_v4_severity":"MEDIUM","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-345"],"nvd_references":["https://www.arista.com/en/support/advisories-notices/security-advisory/24712-security-advisory-0156"],"vuln_status":"Awaiting Analysis","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-15T23:01:07.990703Z","updated_at":"2026-09-18T12:32:27.349964Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"A","value_label":"Adjacent"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"A","value_label":"Adjacent"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"H","value_label":"High"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"H","value_label":"High"},{"metric":"SA","name":"Availability (Subsequent System)","value":"H","value_label":"High"}]},"affected":[{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.36.0","version_start_inclusive":true,"version_end":"4.36.1F","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.36.0:4.36.1F"},{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.35.0","version_start_inclusive":true,"version_end":"4.35.5M","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.35.0:4.35.5M"},{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.34.0","version_start_inclusive":true,"version_end":"4.34.7.1M","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.34.0:4.34.7.1M"},{"vendor_slug":"arista-networks","vendor_name":"Arista Networks","product_slug":"eos","product_name":"EOS","version_start":"4.33.0","version_start_inclusive":true,"version_end":"4.33.9M","version_end_inclusive":true,"cpe23_uri":"cve5:arista-networks:eos:4.33.0:4.33.9M"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24712-security-advisory-0156","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-09-15T21:02:49.314000Z","label":"CVE published","source":null}]}