CVE-2021-31642

MEDIUM

Chiyu-tech Semac S2 Firmware - Integer Overflow

Title source: rule

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.

Exploits (1)

exploitdb WORKING POC

by sirpedrotavares · textwebappshardware

https://www.exploit-db.com/exploits/49937

View Code ZIP pw:eip

References (4)

[Exploit, Third Party Advisory] https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642

[Exploit, Third Party Advisory] https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/

[Vendor Advisory] https://www.chiyu-tech.com/msg/message-Firmware-update-87.html

[Exploit, Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html

Scores

CVSS v3 6.5

EPSS 0.3021

EPSS Percentile 96.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-190

Status published

Products (11)

chiyu-tech/bf-630_firmware

chiyu-tech/bf-631_firmware

chiyu-tech/biosense_firmware

chiyu-tech/semac_d1_firmware

chiyu-tech/semac_d2_firmware

chiyu-tech/semac_d2_n300_firmware

chiyu-tech/semac_d4_firmware

chiyu-tech/semac_s1_osdp_firmware

chiyu-tech/semac_s2_firmware

chiyu-tech/semac_s3v3_firmware

... and 1 more

Published Jun 01, 2021

Tracked Since Feb 18, 2026