What’s Vulnerable › Vulnerabilities

CVE-2021-31249

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 18.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-04 · updated 2026-06-17
• Weakness: CWE-74

Description

A CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of validation on the parameter redirect= available on multiple CGI components.

Affected products

• Chiyu-Tech Bf-430 Firmware: all versions
• Chiyu-Tech Bf-431 Firmware: all versions
• Chiyu-Tech Bf-450M Firmware: all versions

References

• https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249
• 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
• https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249
• 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

Get alerted when CVE-2021-31249 or the next vulnerability affects your stack