Medium severity6.5NVD Advisory· Published Jun 1, 2021· Updated Jun 17, 2026
CVE-2021-31642
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 (> 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16- cpe:2.3:o:chiyu-tech:bf-630_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:bf-631_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:biosense_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d1_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_n300_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d4_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s1_osdp_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s3v3_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:webpass_firmware:-:*:*:*:*:*:*:*
- CHIYU Technology/IoT devicesdescription
Patches
Vulnerability mechanics
References
4- packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.htmlnvdExploitThird Party AdvisoryVDB Entry
- gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devicesnvdExploitThird Party Advisory
- seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/nvdExploitThird Party Advisory
- www.chiyu-tech.com/msg/message-Firmware-update-87.htmlnvdVendor Advisory
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