{"id":"CVE-2021-31642","aliases":["EUVD-2021-18530","GHSA-6jfx-f65x-7qfx"],"status":"published","title":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU...","description":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (\u003e 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.4367,"percentile":0.9876,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-190"],"published":"2021-06-01T14:13:54Z","modified":"2026-06-17T03:52:06Z","exploits":[{"source":"exploitdb","id":"EDB-49937","title":"CHIYU IoT Devices - Denial of Service (DoS)","type":"webapps","platform":"hardware","date":"2021-06-03","url":"https://www.exploit-db.com/exploits/49937"}],"products":[{"vendor":"chiyu-tech","product":"bf-630_firmware"},{"vendor":"chiyu-tech","product":"bf-631_firmware"},{"vendor":"chiyu-tech","product":"biosense_firmware"},{"vendor":"chiyu-tech","product":"semac_d1_firmware"},{"vendor":"chiyu-tech","product":"semac_d2_firmware"},{"vendor":"chiyu-tech","product":"semac_d2_n300_firmware"},{"vendor":"chiyu-tech","product":"semac_d4_firmware"},{"vendor":"chiyu-tech","product":"semac_s1_osdp_firmware"},{"vendor":"chiyu-tech","product":"semac_s2_firmware"},{"vendor":"chiyu-tech","product":"semac_s3v3_firmware"},{"vendor":"chiyu-tech","product":"webpass_firmware"}],"references":[{"url":"https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.chiyu-tech.com/msg/message-Firmware-update-87.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31642"},{"url":"https://github.com/advisories/GHSA-6jfx-f65x-7qfx"}],"sources":{"cve":[{"id":"CVE-2021-31642","description":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (\u003e 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.","status":"published","published":"2021-06-01T14:13:54Z","modified":"2024-08-03T23:03:33.642Z","updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18530","description":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (\u003e 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.","status":"published","published":"2021-06-01T14:13:54Z","modified":"2024-08-03T23:03:33Z","updated_at":"2026-11-03T03:24:38.423371Z"}],"ghsa":[{"id":"GHSA-6jfx-f65x-7qfx","title":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU...","description":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (\u003e 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.","status":"published","published":"2022-05-24T19:03:41Z","modified":"2023-01-29T05:07:47Z","cwes":["CWE-190"],"updated_at":"2026-11-02T14:46:11.123221Z"}],"nvd":[{"id":"CVE-2021-31642","description":"A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (\u003e 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.","status":"published","published":"2021-06-01T15:15:07.717Z","modified":"2026-06-17T03:52:06.587Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}