{"cve":{"cve_id":"CVE-2023-36521","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":0.00524,"epss_percentile":0.40265,"epss_as_of":"2026-06-23","description":"A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). The result synchronization server of the affected products contains a\r\nvulnerability that may lead to a denial of service condition. An attacker may\r\ncause a denial of service situation of all socket-based communication of the\r\naffected products if the result server is enabled.","published_at":"2023-07-11T09:07:13.637000Z","last_modified_at":null,"cvss_v3_score":8.6,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-770"],"nvd_references":["https://cert-portal.siemens.com/productcert/pdf/ssa-561322.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":"2026-06-29T01:33:40.240625Z"},"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":"C","value_label":"Changed"},{"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-mv540-h","product_name":"SIMATIC MV540 H","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv540-h:All versions < V3.3.4:All versions < V3.3.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-mv540-s","product_name":"SIMATIC MV540 S","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv540-s:All versions < V3.3.4:All versions < V3.3.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-mv550-h","product_name":"SIMATIC MV550 H","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv550-h:All versions < V3.3.4:All versions < V3.3.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-mv550-s","product_name":"SIMATIC MV550 S","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv550-s:All versions < V3.3.4:All versions < V3.3.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-mv560-u","product_name":"SIMATIC MV560 U","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv560-u:All versions < V3.3.4:All versions < V3.3.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-mv560-x","product_name":"SIMATIC MV560 X","version_start":"All versions < V3.3.4","version_start_inclusive":true,"version_end":"All versions < V3.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-mv560-x:All versions < V3.3.4:All versions < V3.3.4"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2023-07-11T09:07:13.637000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:29:00.783215Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:00.783215Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:00.783215Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"}]}