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7.5
CVSSv2

CVE-2021-31251

Published: 04/06/2021 Updated: 08/06/2021
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9
VMScore: 668
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
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Vulnerability Summary

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.

Vulnerability Trend

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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 -

Exploits

Exploit DB: CHIYU IoT Telnet Authentication Bypass
Several IoT devices from the CHIYU Technology firm are vulnerable to a flaw that permits bypassing the telnet authentication process due to an overflow during the negotiation of the telnet protocol Telnet authentication is bypassed by supplying a specially malformed request, and an attacker may force the remote telnet server to believe that the us ...

References

CWE-287https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlhttps://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguUhttps://nvd.nist.govhttps://packetstormsecurity.com/files/162933/CHIYU-IoT-Telnet-Authentication-Bypass.html
CVSSv2
CVSSv2
CVSSv3
VMScore
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