{"cve":{"cve_id":"CVE-2021-33737","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":0.01022,"epss_percentile":0.58938,"epss_as_of":"2026-06-23","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 Advanced (All versions < V3.3), SIPLUS NET CP 443-1 (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (All versions < V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.","published_at":"2021-09-14T10:47:38Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-119"],"nvd_references":["https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf"],"vuln_status":null,"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":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:44.549352Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"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":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"},{"metric":"E","name":"E","value":"P","value_label":"Physical"},{"metric":"RL","name":"RL","value":"U","value_label":"Unchanged"},{"metric":"RC","name":"RC","value":"C","value_label":"Changed"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-343-1-advanced-incl.-siplus-variants","product_name":"SIMATIC CP 343-1 Advanced (incl. SIPLUS variants)","version_start":"All versions","version_start_inclusive":true,"version_end":"All versions","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-343-1-advanced-incl.-siplus-variants:All versions:All versions"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-343-1-erpc","product_name":"SIMATIC CP 343-1 ERPC","version_start":"All versions","version_start_inclusive":true,"version_end":"All versions","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-343-1-erpc:All versions:All versions"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-343-1-incl.-siplus-variants","product_name":"SIMATIC CP 343-1 (incl. SIPLUS variants)","version_start":"All versions","version_start_inclusive":true,"version_end":"All versions","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-343-1-incl.-siplus-variants:All versions:All versions"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-343-1-lean-incl.-siplus-variants","product_name":"SIMATIC CP 343-1 Lean (incl. SIPLUS variants)","version_start":"All versions","version_start_inclusive":true,"version_end":"All versions","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-343-1-lean-incl.-siplus-variants:All versions:All versions"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-443-1","product_name":"SIMATIC CP 443-1","version_start":"All versions < V3.3","version_start_inclusive":true,"version_end":"All versions < V3.3","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-443-1:All versions < V3.3:All versions < V3.3"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-cp-443-1-advanced","product_name":"SIMATIC CP 443-1 Advanced","version_start":"All versions < V3.3","version_start_inclusive":true,"version_end":"All versions < V3.3","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-cp-443-1-advanced:All versions < V3.3:All versions < V3.3"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"siplus-net-cp-443-1","product_name":"SIPLUS NET CP 443-1","version_start":"All versions < V3.3","version_start_inclusive":true,"version_end":"All versions < V3.3","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:siplus-net-cp-443-1:All versions < V3.3:All versions < V3.3"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"siplus-net-cp-443-1-advanced","product_name":"SIPLUS NET CP 443-1 Advanced","version_start":"All versions < V3.3","version_start_inclusive":true,"version_end":"All versions < V3.3","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:siplus-net-cp-443-1-advanced:All versions < V3.3:All versions < V3.3"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-09-14T10:47:38Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:18:38.387826Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:18:38.387826Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:18:38.387826Z","label":"CVSS score revised","source":"cvelistv5"}]}