Vulnerability Description
An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chiyu-Tech | Bf-430 Firmware | - |
| Chiyu-Tech | Bf-430 | - |
| Chiyu-Tech | Bf-431 Firmware | - |
| Chiyu-Tech | Bf-431 | - |
| Chiyu-Tech | Bf-450M Firmware | - |
| Chiyu-Tech | Bf-450M | - |
| Chiyu-Tech | Semac S2 Firmware | - |
| Chiyu-Tech | Semac S2 | - |
| Chiyu-Tech | Semac D1 Firmware | - |
| Chiyu-Tech | Semac D1 | - |
| Chiyu-Tech | Semac D2 Firmware | - |
| Chiyu-Tech | Semac D2 | - |
| Chiyu-Tech | Semac D4 Firmware | - |
| Chiyu-Tech | Semac D4 | - |
| Chiyu-Tech | Semac S3V3 Firmware | - |
| Chiyu-Tech | Semac S3V3 | - |
| Chiyu-Tech | Semac D2 N300 Firmware | - |
| Chiyu-Tech | Semac D2 N300 | - |
| Chiyu-Tech | Semac S1 Osdp Firmware | - |
| Chiyu-Tech | Semac S1 Osdp | - |
Related Weaknesses (CWE)
References
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devicesExploitThird Party Advisory
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-ExploitThird Party Advisory
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlVendor Advisory
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devicesExploitThird Party Advisory
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-ExploitThird Party Advisory
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlVendor Advisory
FAQ
What is CVE-2021-31251?
CVE-2021-31251 is a vulnerability with a CVSS score of 9.8 (CRITICAL). An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by s...
How severe is CVE-2021-31251?
CVE-2021-31251 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-31251?
Check the references section above for vendor advisories and patch information. Affected products include: Chiyu-Tech Bf-430 Firmware, Chiyu-Tech Bf-430, Chiyu-Tech Bf-431 Firmware, Chiyu-Tech Bf-431, Chiyu-Tech Bf-450M Firmware.