Critical severity9.8NVD Advisory· Published Jun 4, 2021· Updated Jun 17, 2026

CVE-2021-31251

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

CHIYU Technology Inc/TCP/IP Converterdescription
CHIYU Technology/BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMACllm-create
CHIYU Technology/BF-450M and SEMACllm-create

Patches

Vulnerability mechanics

References

gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devicesnvdExploitThird Party Advisory
seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/nvdExploitThird Party Advisory
www.chiyu-tech.com/msg/message-Firmware-update-87.htmlnvdVendor Advisory

News mentions

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epss	0.029
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