{"id":"CVE-2021-31340","aliases":["EUVD-2021-18250","GHSA-hjxf-6qxm-x8qg"],"status":"published","title":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC...","description":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF185C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF360R (All versions \u003c V2.0), SIMATIC Reader RF610R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R FCC (All versions \u003e V3.0 \u003c 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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00988,"percentile":0.62759,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2021-06-08T19:47:16Z","modified":"2026-06-17T03:51:34Z","products":[{"vendor":"siemens","product":"simatic reader rf610r cmiit"},{"vendor":"siemens","product":"simatic reader rf610r etsi"},{"vendor":"siemens","product":"simatic reader rf610r fcc"},{"vendor":"siemens","product":"simatic reader rf615r cmiit"},{"vendor":"siemens","product":"simatic reader rf615r etsi"},{"vendor":"siemens","product":"simatic reader rf615r fcc"},{"vendor":"siemens","product":"simatic reader rf650r arib"},{"vendor":"siemens","product":"simatic reader rf650r cmiit"},{"vendor":"siemens","product":"simatic reader rf650r etsi"},{"vendor":"siemens","product":"simatic reader rf650r fcc"},{"vendor":"siemens","product":"simatic reader rf680r arib"},{"vendor":"siemens","product":"simatic reader rf680r cmiit"},{"vendor":"siemens","product":"simatic reader rf680r etsi"},{"vendor":"siemens","product":"simatic reader rf680r fcc"},{"vendor":"siemens","product":"simatic reader rf685r arib"},{"vendor":"siemens","product":"simatic reader rf685r cmiit"},{"vendor":"siemens","product":"simatic reader rf685r etsi"},{"vendor":"siemens","product":"simatic reader rf685r fcc"},{"vendor":"siemens","product":"simatic rf166c"},{"vendor":"siemens","product":"simatic rf185c"},{"vendor":"siemens","product":"simatic rf186c"},{"vendor":"siemens","product":"simatic rf186ci"},{"vendor":"siemens","product":"simatic rf188c"},{"vendor":"siemens","product":"simatic rf188ci"},{"vendor":"siemens","product":"simatic rf360r"},{"vendor":"siemens","product":"simatic_reader_rf610r_cmiit_firmware"},{"vendor":"siemens","product":"simatic_reader_rf610r_etsi_firmware"},{"vendor":"siemens","product":"simatic_reader_rf610r_fcc_firmware"},{"vendor":"siemens","product":"simatic_reader_rf615r_cmiit_firmware"},{"vendor":"siemens","product":"simatic_reader_rf615r_etsi_firmware"},{"vendor":"siemens","product":"simatic_reader_rf615r_fcc_firmware"},{"vendor":"siemens","product":"simatic_reader_rf650r_arib_firmware"},{"vendor":"siemens","product":"simatic_reader_rf650r_cmiit_firmware"},{"vendor":"siemens","product":"simatic_reader_rf650r_etsi_firmware"},{"vendor":"siemens","product":"simatic_reader_rf650r_fcc_firmware"},{"vendor":"siemens","product":"simatic_reader_rf680r_arib_firmware"},{"vendor":"siemens","product":"simatic_reader_rf680r_cmiit_firmware"},{"vendor":"siemens","product":"simatic_reader_rf680r_etsi_firmware"},{"vendor":"siemens","product":"simatic_reader_rf680r_fcc_firmware"},{"vendor":"siemens","product":"simatic_reader_rf685r_arib_firmware"},{"vendor":"siemens","product":"simatic_reader_rf685r_cmiit_firmware"},{"vendor":"siemens","product":"simatic_reader_rf685r_etsi_firmware"},{"vendor":"siemens","product":"simatic_reader_rf685r_fcc_firmware"},{"vendor":"siemens","product":"simatic_rf166c_firmware"},{"vendor":"siemens","product":"simatic_rf185c_firmware"},{"vendor":"siemens","product":"simatic_rf186c_firmware"},{"vendor":"siemens","product":"simatic_rf186ci_firmware"},{"vendor":"siemens","product":"simatic_rf188c_firmware"},{"vendor":"siemens","product":"simatic_rf188ci_firmware"},{"vendor":"siemens","product":"simatic_rf360r_firmware"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf","tags":["x_refsource_MISC","x_transferred","Mitigation","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31340"},{"url":"https://github.com/advisories/GHSA-hjxf-6qxm-x8qg"}],"sources":{"cve":[{"id":"CVE-2021-31340","description":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF185C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF360R (All versions \u003c V2.0), SIMATIC Reader RF610R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R FCC (All versions \u003e V3.0 \u003c 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.","status":"published","published":"2021-06-08T19:47:16Z","modified":"2024-08-03T22:55:53.544Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:33:05.331617Z"}],"euvd":[{"id":"EUVD-2021-18250","description":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF185C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF360R (All versions \u003c V2.0), SIMATIC Reader RF610R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R FCC (All versions \u003e V3.0 \u003c 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.","status":"published","published":"2021-06-08T19:47:16Z","modified":"2024-08-03T22:55:53Z","updated_at":"2026-11-03T03:24:39.559154Z"}],"ghsa":[{"id":"GHSA-hjxf-6qxm-x8qg","title":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC...","description":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF185C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF360R (All versions), SIMATIC RF615R (All versions \u003e V3.0), SIMATIC RF680R (All versions \u003e V3.0), SIMATIC RF685R (All versions \u003e V3.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.","status":"published","published":"2022-05-24T19:04:17Z","modified":"2023-01-29T05:06:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:46:07.317218Z"}],"nvd":[{"id":"CVE-2021-31340","description":"A vulnerability has been identified in SIMATIC RF166C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF185C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF186CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188C (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF188CI (All versions \u003e V1.1 and \u003c V1.3.2), SIMATIC RF360R (All versions \u003c V2.0), SIMATIC Reader RF610R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF610R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF615R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF650R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF680R FCC (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ARIB (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R CMIIT (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R ETSI (All versions \u003e V3.0 \u003c V4.0), SIMATIC Reader RF685R FCC (All versions \u003e V3.0 \u003c 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.","status":"published","published":"2021-06-08T20:15:08.853Z","modified":"2026-06-17T03:51:34.477Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:54.439974Z"}]}}