{"cve":{"cve_id":"CVE-2021-37205","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":0.01615,"epss_percentile":0.72865,"epss_as_of":"2026-06-23","description":"A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations.","published_at":"2022-02-09T15:16:57Z","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:O/RC:C","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-401"],"nvd_references":["https://cert-portal.siemens.com/productcert/pdf/ssa-838121.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":"2026-06-28T23:15:56.479186Z"},"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":"O","value_label":"O"},{"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-drive-controller-family","product_name":"SIMATIC Drive Controller family","version_start":"All versions >= V2.9.2 < V2.9.4","version_start_inclusive":true,"version_end":"All versions >= V2.9.2 < V2.9.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-drive-controller-family:All versions >= V2.9.2 < V2.9.4:All versions >= V2.9.2 < V2.9.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-et-200sp-open-controller-cpu-1515sp-pc2-incl.-siplus-variants","product_name":"SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)","version_start":"All versions >= V21.9 < V21.9.4","version_start_inclusive":true,"version_end":"All versions >= V21.9 < V21.9.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-et-200sp-open-controller-cpu-1515sp-pc2-incl.-siplus-variants:All versions >= V21.9 < V21.9.4:All versions >= V21.9 < V21.9.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-s7-1200-cpu-family-incl.-siplus-variants","product_name":"SIMATIC S7-1200 CPU family (incl. SIPLUS variants)","version_start":"All versions >= V4.5.0 < V4.5.2","version_start_inclusive":true,"version_end":"All versions >= V4.5.0 < V4.5.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-s7-1200-cpu-family-incl.-siplus-variants:All versions >= V4.5.0 < V4.5.2:All versions >= V4.5.0 < V4.5.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-s7-1500-cpu-family-incl.-related-et200-cpus-and-siplus-variants","product_name":"SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)","version_start":"All versions >= V2.9.2 < V2.9.4","version_start_inclusive":true,"version_end":"All versions >= V2.9.2 < V2.9.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-s7-1500-cpu-family-incl.-related-et200-cpus-and-siplus-variants:All versions >= V2.9.2 < V2.9.4:All versions >= V2.9.2 < V2.9.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-s7-1500-software-controller","product_name":"SIMATIC S7-1500 Software Controller","version_start":"All versions >= V21.9 < V21.9.4","version_start_inclusive":true,"version_end":"All versions >= V21.9 < V21.9.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-s7-1500-software-controller:All versions >= V21.9 < V21.9.4:All versions >= V21.9 < V21.9.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-s7-plcsim-advanced","product_name":"SIMATIC S7-PLCSIM Advanced","version_start":"All versions >= V4.0 < V4.0 SP1","version_start_inclusive":true,"version_end":"All versions >= V4.0 < V4.0 SP1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-s7-plcsim-advanced:All versions >= V4.0 < V4.0 SP1:All versions >= V4.0 < V4.0 SP1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"siplus-tim-1531-irc","product_name":"SIPLUS TIM 1531 IRC","version_start":"All versions < V2.3.6","version_start_inclusive":true,"version_end":"All versions < V2.3.6","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:siplus-tim-1531-irc:All versions < V2.3.6:All versions < V2.3.6"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"tim-1531-irc","product_name":"TIM 1531 IRC","version_start":"All versions < V2.3.6","version_start_inclusive":true,"version_end":"All versions < V2.3.6","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:tim-1531-irc:All versions < V2.3.6:All versions < V2.3.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-02-09T15:16:57Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-06-24T00:31:44.034298Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:44.034298Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:44.034298Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:44.034298Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:44.034298Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:44.034298Z","label":"CVSS score revised","source":"vulnrichment"}]}