{"cve":{"cve_id":"CVE-2021-31340","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":0.00988,"epss_percentile":0.57911,"epss_as_of":"2026-06-23","description":"A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and < V1.3.2), SIMATIC RF186C (All versions > V1.1 and < V1.3.2), SIMATIC RF186CI (All versions > V1.1 and < V1.3.2), SIMATIC RF188C (All versions > V1.1 and < V1.3.2), SIMATIC RF188CI (All versions > V1.1 and < V1.3.2), SIMATIC RF360R (All versions < V2.0), SIMATIC Reader RF610R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF610R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF610R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF615R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF615R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF615R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF650R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF650R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF680R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF680R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF685R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF685R FCC (All versions > V3.0 < V4.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.","published_at":"2021-06-08T19:47:16Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"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-400"],"nvd_references":["https://cert-portal.siemens.com/productcert/pdf/ssa-787292.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":"2026-06-28T23:15:35.002048Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf610r-cmiit","product_name":"SIMATIC Reader RF610R CMIIT","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf610r-cmiit:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf610r-etsi","product_name":"SIMATIC Reader RF610R ETSI","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf610r-etsi:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf610r-fcc","product_name":"SIMATIC Reader RF610R FCC","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf610r-fcc:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf615r-cmiit","product_name":"SIMATIC Reader RF615R CMIIT","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf615r-cmiit:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf615r-etsi","product_name":"SIMATIC Reader RF615R ETSI","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf615r-etsi:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf615r-fcc","product_name":"SIMATIC Reader RF615R FCC","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf615r-fcc:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf650r-arib","product_name":"SIMATIC Reader RF650R ARIB","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf650r-arib:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf650r-cmiit","product_name":"SIMATIC Reader RF650R CMIIT","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf650r-cmiit:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf650r-etsi","product_name":"SIMATIC Reader RF650R ETSI","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf650r-etsi:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf650r-fcc","product_name":"SIMATIC Reader RF650R FCC","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf650r-fcc:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf680r-arib","product_name":"SIMATIC Reader RF680R ARIB","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf680r-arib:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf680r-cmiit","product_name":"SIMATIC Reader RF680R CMIIT","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf680r-cmiit:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf680r-etsi","product_name":"SIMATIC Reader RF680R ETSI","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf680r-etsi:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf680r-fcc","product_name":"SIMATIC Reader RF680R FCC","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf680r-fcc:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf685r-arib","product_name":"SIMATIC Reader RF685R ARIB","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf685r-arib:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf685r-cmiit","product_name":"SIMATIC Reader RF685R CMIIT","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf685r-cmiit:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf685r-etsi","product_name":"SIMATIC Reader RF685R ETSI","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf685r-etsi:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-reader-rf685r-fcc","product_name":"SIMATIC Reader RF685R FCC","version_start":"All versions > V3.0 < V4.0","version_start_inclusive":true,"version_end":"All versions > V3.0 < V4.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-reader-rf685r-fcc:All versions > V3.0 < V4.0:All versions > V3.0 < V4.0"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf166c","product_name":"SIMATIC RF166C","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf166c:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf185c","product_name":"SIMATIC RF185C","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf185c:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf186c","product_name":"SIMATIC RF186C","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf186c:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf186ci","product_name":"SIMATIC RF186CI","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf186ci:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf188c","product_name":"SIMATIC RF188C","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf188c:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf188ci","product_name":"SIMATIC RF188CI","version_start":"All versions > V1.1 and < V1.3.2","version_start_inclusive":true,"version_end":"All versions > V1.1 and < V1.3.2","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf188ci:All versions > V1.1 and < V1.3.2:All versions > V1.1 and < V1.3.2"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-rf360r","product_name":"SIMATIC RF360R","version_start":"All versions < V2.0","version_start_inclusive":true,"version_end":"All versions < V2.0","version_end_inclusive":true,"cpe23_uri":"cve5:siemens:simatic-rf360r:All versions < V2.0:All versions < V2.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-06-08T19:47:16Z","label":"CVE published","source":null}]}