{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "datePublic": "2021-06-04T00:00:00", "descriptions": [{"lang": "en", "value": "An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-06-04T20:25:52", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://www.chiyu-tech.com/msg/message-Firmware-update-87.html"}, {"tags": ["x_refsource_MISC"], "url": "https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251"}, {"tags": ["x_refsource_MISC"], "url": "https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-31251", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://www.chiyu-tech.com/msg/message-Firmware-update-87.html", "refsource": "CONFIRM", "url": "https://www.chiyu-tech.com/msg/message-Firmware-update-87.html"}, {"name": "https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251", "refsource": "MISC", "url": "https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251"}, {"name": "https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU", "refsource": "MISC", "url": "https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:55:53.355Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.chiyu-tech.com/msg/message-Firmware-update-87.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-31251", "datePublished": "2021-06-04T20:25:52", "dateReserved": "2021-04-15T00:00:00", "dateUpdated": "2024-08-03T22:55:53.355Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:bf-430_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "FA0C36F7-25D5-4A51-B312-C924362A8A29", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:bf-430:-:*:*:*:*:*:*:*", "matchCriteriaId": "E4E3D910-0317-4B0B-BB33-15B86AB3E4EB", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:bf-431_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "C137757C-105F-400D-93F3-4620975011B2", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:bf-431:-:*:*:*:*:*:*:*", "matchCriteriaId": "23BF3F3D-7752-492B-87E9-949AFA19F85A", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:bf-450m_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "B5039F6C-F563-4944-A977-0D79BC6E2B17", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:bf-450m:-:*:*:*:*:*:*:*", "matchCriteriaId": "CD504C8D-7E80-48EF-B3F6-93FC6AEE031E", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_s2:-:*:*:*:*:*:*:*", "matchCriteriaId": "BDAC8B2A-8AB4-4EAB-84D5-526F89C8D9B6", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "E605EBAB-D5F9-43A8-8096-DA62A4295A92", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_d1:-:*:*:*:*:*:*:*", "matchCriteriaId": "59C613EE-4884-4CD6-B4BA-AF41FD26DB35", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_d1_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "A4B14981-FCEA-45FC-896F-7677BEB7A8FB", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_d2:-:*:*:*:*:*:*:*", "matchCriteriaId": "7123F403-1044-4ECC-A6F8-AB8E0173432B", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_d2_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "10BBB47A-E6EF-4EE5-A74C-F7766004880B", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_d4:-:*:*:*:*:*:*:*", "matchCriteriaId": "0F4E3539-D33A-48E1-8B09-4D010BEAC9C1", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_d4_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "D6A0946C-6A4F-4A9E-9D7C-702A74236C89", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_s3v3:-:*:*:*:*:*:*:*", "matchCriteriaId": "231A210D-7A72-4E54-BF7D-2594F2735D68", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_s3v3_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "DF097E2D-8F46-4EE0-9C0E-449EDC5FE373", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_d2_n300:-:*:*:*:*:*:*:*", "matchCriteriaId": "24D35D62-9633-410F-9D2D-FD61CD5A820B", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_d2_n300_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "52481D14-6CDD-4D28-ACEB-83EC3FAC7F4D", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:h:chiyu-tech:semac_s1_osdp:-:*:*:*:*:*:*:*", "matchCriteriaId": "965D6B8E-A7E7-40B3-A4C3-4942E61491A5", "vulnerable": false}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:chiyu-tech:semac_s1_osdp_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "B982FDE3-0F08-46F8-8A50-BB5650AA5076", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated."}, {"lang": "es", "value": "Una omisi\u00f3n de autenticaci\u00f3n en el servidor telnet de los convertidores TCP/IP BF-430 y BF431 232/422, BF-450M y SEMAC de CHIYU Technology Inc,. permite obtener una conexi\u00f3n privilegiada con el dispositivo de destino al suministrar una petici\u00f3n especialmente malformada y un atacante puede forzar al servidor telnet remoto a creer que el usuario ya se ha autenticado"}], "id": "CVE-2021-31251", "lastModified": "2021-06-08T18:46:54.350", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-04T21:15:07.517", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://www.chiyu-tech.com/msg/message-Firmware-update-87.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}