{"cve":{"cve_id":"CVE-2021-25667","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":0.00852,"epss_percentile":0.53451,"epss_as_of":"2026-06-23","description":"A vulnerability has been identified in RUGGEDCOM RM1224 (All versions >= V4.3 and < V6.4), SCALANCE M-800 (All versions >= V4.3 and < V6.4), SCALANCE S615 (All versions >= V4.3 and < V6.4), SCALANCE SC-600 Family (All versions >= V2.0 and < V2.1.3), SCALANCE XB-200 (All versions < V4.1), SCALANCE XC-200 (All versions < V4.1), SCALANCE XF-200BA (All versions < V4.1), SCALANCE XM400 (All versions < V6.2), SCALANCE XP-200 (All versions < V4.1), SCALANCE XR-300WG (All versions < V4.1), SCALANCE XR500 (All versions < V6.2). Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution. Successful exploitation requires the passive listening feature of the device to be active.","published_at":"2021-03-15T17:03:31Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-121"],"nvd_references":["https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf","https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03"],"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":"2026-06-28T23:15:16.213984Z"},"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":"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"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"ruggedcom-rm1224","product_name":"RUGGEDCOM RM1224","version_start":"All versions >= V4.3 and < V6.4","version_start_inclusive":true,"version_end":"All versions >= V4.3 and < V6.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:ruggedcom-rm1224:All versions >= V4.3 and < V6.4:All versions >= V4.3 and < V6.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-m-800","product_name":"SCALANCE M-800","version_start":"All versions >= V4.3 and < V6.4","version_start_inclusive":true,"version_end":"All versions >= V4.3 and < V6.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-m-800:All versions >= V4.3 and < V6.4:All versions >= V4.3 and < V6.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-s615","product_name":"SCALANCE S615","version_start":"All versions >= V4.3 and < V6.4","version_start_inclusive":true,"version_end":"All versions >= V4.3 and < V6.4","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-s615:All versions >= V4.3 and < V6.4:All versions >= V4.3 and < V6.4"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-sc-600-family","product_name":"SCALANCE SC-600 Family","version_start":"All versions >= V2.0 and < V2.1.3","version_start_inclusive":true,"version_end":"All versions >= V2.0 and < V2.1.3","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-sc-600-family:All versions >= V2.0 and < V2.1.3:All versions >= V2.0 and < V2.1.3"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xb-200","product_name":"SCALANCE XB-200","version_start":"All versions < V4.1","version_start_inclusive":true,"version_end":"All versions < V4.1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xb-200:All versions < V4.1:All versions < V4.1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xc-200","product_name":"SCALANCE XC-200","version_start":"All versions < V4.1","version_start_inclusive":true,"version_end":"All versions < V4.1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xc-200:All versions < V4.1:All versions < V4.1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xf-200ba","product_name":"SCALANCE XF-200BA","version_start":"All versions < V4.1","version_start_inclusive":true,"version_end":"All versions < V4.1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xf-200ba:All versions < V4.1:All versions < V4.1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xm400","product_name":"SCALANCE XM400","version_start":"All versions < V6.2","version_start_inclusive":true,"version_end":"All versions < V6.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xm400:All versions < V6.2:All versions < V6.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xp-200","product_name":"SCALANCE XP-200","version_start":"All versions < V4.1","version_start_inclusive":true,"version_end":"All versions < V4.1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xp-200:All versions < V4.1:All versions < V4.1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xr-300wg","product_name":"SCALANCE XR-300WG","version_start":"All versions < V4.1","version_start_inclusive":true,"version_end":"All versions < V4.1","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xr-300wg:All versions < V4.1:All versions < V4.1"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"scalance-xr500","product_name":"SCALANCE XR500","version_start":"All versions < V6.2","version_start_inclusive":true,"version_end":"All versions < V6.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:scalance-xr500:All versions < V6.2:All versions < V6.2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf","source_type":"MISC","tags":[]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2021-03-15T17:03:31Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"}]}