CVE-2021-31642

EPSS 43.7%

Vexday Risk Score

35Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS —EPSS 43.7%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

01 Jun 2021Published on NVD

03 Jun 2021Public PoC

Weaponization speed

1 daysto first PoC

Weaponized quickly — attackers prioritized this vulnerability. Patch urgently.

Recommendation: Plan a near-term fix — a public PoC already exists.

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

n/a · n/a

public PoCs found — 2

cve_referencepacketstormsecurity.com/files/162934/CHIYU-IoT-Denial-Of-Service.htmlunverified exploitdbwww.exploit-db.com/exploits/49937unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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