CVE-2021-31251

CRITICAL 9.8CVE-2021-31251 · Published 04/06/2021 · updated 17/06/2026

In short

CVE-2021-31251 is a CRITICAL (CVSS 9.8) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 35.7%, higher than 98.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices · Exploit
seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks · Exploit
chiyu-tech.com/msg/message-Firmware-update-87.html · Vendor Advisory

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