CVE-2021-31642

high-risk
Published 2021-06-01

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.

Do I need to act?

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30.2% chance of exploitation in next 30 days
EPSS score — higher than 70% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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1 public exploit available
49937
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (11)

Semac S2 Firmware
Semac D1 Firmware
Semac D2 Firmware
Semac D4 Firmware
Semac S3V3 Firmware
Semac D2 N300 Firmware
Semac S1 Osdp Firmware
Bf-630 Firmware
Webpass Firmware

Affected Vendors

Chiyu-Tech

References (8)

Exploit http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html
Exploit https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices...
Exploit https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-...
Vendor Advisory https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
Exploit http://packetstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.html
Exploit https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices...
Exploit https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-...
Vendor Advisory https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
55
/ 100
high-risk
Severity 24/34 · High
Exploitability 15/34 · Moderate
Exposure 16/34 · Moderate