Integer overflow in Chiyu-Tech Bf-630
CVE-2021-31642
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.437 (98.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.437 · newest: 0.437 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices (Exploit, Third Party Advisory)
- seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-… (Exploit, Third Party Advisory)
- www.chiyu-tech.com/msg/message-Firmware-update-87.html (Vendor Advisory)
- packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31642?
- CVE-2021-31642 is a medium-severity vulnerability in Chiyu-Tech Bf-630, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2021-06-01.
- How severe is CVE-2021-31642?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-31642 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.