CVE-2021-31251

Public Exploit

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 9.59% Top 10%
Vendor Advisory chiyu-tech.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
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 third party advisory exploit
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-31251?
CVE-2021-31251 has been scored as a critical severity vulnerability.
How to fix CVE-2021-31251?
To fix CVE-2021-31251, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-31251 being actively exploited in the wild?
It is possible that CVE-2021-31251 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~10% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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