What’s Vulnerable › Vulnerabilities
CVE-2021-31642
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 43.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-06-01 · updated 2026-06-17
- Weakness: CWE-190
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.
Affected products
- Chiyu-Tech Bf-630 Firmware: all versions
- Chiyu-Tech Bf-631 Firmware: all versions
- Chiyu-Tech Biosense Firmware: all versions
- Chiyu-Tech Semac D1 Firmware: all versions
- Chiyu-Tech Semac D2 Firmware: all versions
- Chiyu-Tech Semac D2 N300 Firmware: all versions
- Chiyu-Tech Semac D4 Firmware: all versions
- Chiyu-Tech Semac S1 Osdp Firmware: all versions
- Chiyu-Tech Semac S2 Firmware: all versions
- Chiyu-Tech Semac S3V3 Firmware: all versions
- Chiyu-Tech Webpass Firmware: all versions
References
- http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
- http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
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