CVEvulnerability
CVE-2021-31251
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2021-06-04
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-287
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.
Affected configurations
• chiyu-tech bf-430 firmware
• chiyu-tech bf-431 firmware
• chiyu-tech bf-450m firmware
• chiyu-tech semac s2 firmware
• chiyu-tech semac d1 firmware
• chiyu-tech semac d2 firmware
• chiyu-tech semac d4 firmware
• chiyu-tech semac s3v3 firmware
• chiyu-tech semac d2 n300 firmware
• chiyu-tech semac s1 osdp firmware
Related
Weakness · CWE (1)
- CWE-287 Improper Authentication weakness
References
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251 Exploit, Third Party Advisory
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU Exploit, Third Party Advisory
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html Vendor Advisory
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251 Exploit, Third Party Advisory
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU Exploit, Third Party Advisory
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html Vendor Advisory