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    CVE-2021-31251

    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.

    Published:Jun 4, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 4, 2021
    EPSS Score:0.09587
    CVSS Score:9.8

    Affected Products

    Vendor
    Chiyu-tech
    Product
    Bf-430
    Vendor
    Chiyu-tech
    Product
    Bf-430 Firmware
    Vendor
    Chiyu-tech
    Product
    Bf-431
    Vendor
    Chiyu-tech
    Product
    Bf-431 Firmware
    Vendor
    Chiyu-tech
    Product
    Bf-450m
    Vendor
    Chiyu-tech
    Product
    Bf-450m Firmware
    Vendor
    Chiyu-tech
    Product
    Semac D1
    Vendor
    Chiyu-tech
    Product
    Semac D1 Firmware
    Vendor
    Chiyu-tech
    Product
    Semac D2
    Vendor
    Chiyu-tech
    Product
    Semac D2 Firmware
    Vendor
    Chiyu-tech
    Product
    Semac D2 N300
    Vendor
    Chiyu-tech
    Product
    Semac D2 N300 Firmware
    Vendor
    Chiyu-tech
    Product
    Semac D4
    Vendor
    Chiyu-tech
    Product
    Semac D4 Firmware
    Vendor
    Chiyu-tech
    Product
    Semac S1 Osdp
    Vendor
    Chiyu-tech
    Product
    Semac S1 Osdp Firmware
    Vendor
    Chiyu-tech
    Product
    Semac S2
    Vendor
    Chiyu-tech
    Product
    Semac S2 Firmware
    Vendor
    Chiyu-tech
    Product
    Semac S3v3
    Vendor
    Chiyu-tech
    Product
    Semac S3v3 Firmware

    Exploits

    https://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://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://www.exploit-db.com/exploits/49936

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High