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    CVE-2021-21969

    An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. The HandleIncomingSeaCloudMessage function uses at [4] the json_object_get_string to populate the p_payload global variable. The p_payload is only 0x100 bytes long, and the total MQTT message could be up to 0x201 bytes. Because the function json_object_get_string will fill str based on the length of the json’s value and not the actual str size, this would result in a possible out-of-bounds write.

    Published:Feb 4, 2022
    Last Modified:Apr 15, 2025
    EPS:Feb 4, 2022
    EPSS Score:0.00439
    CVSS Score:8.1

    Affected Products

    Vendor
    Sealevel
    Product
    Seaconnect 370w
    Vendor
    Sealevel
    Product
    Seaconnect 370w Firmware

    Exploits

    https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396

    Related CVEs

    CVE-2021-21967 (CVSS 5.9) — An out-of-bounds write vulnerability exists in the OTA update task functionality of Sealevel Systems, Inc. Sea…
    CVE-2021-21962 (CVSS 8.1) — A heap-based buffer overflow vulnerability exists in the OTA Update u-download functionality of Sealevel Syste…
    CVE-2021-21968 (CVSS 8.3) — A file write vulnerability exists in the OTA update task functionality of Sealevel Systems, Inc. SeaConnect 37…
    CVE-2021-21959 (CVSS 8.1) — A misconfiguration exists in the MQTTS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. This m…
    CVE-2021-21964 (CVSS 7.4) — A denial of service vulnerability exists in the Modbus configuration functionality of Sealevel Systems, Inc. S…
    CVE-2021-21965 (CVSS 9.3) — A denial of service vulnerability exists in the SeaMax remote configuration functionality of Sealevel Systems,…
    CVE-2021-21961 (CVSS 10) — A stack-based buffer overflow vulnerability exists in the NBNS functionality of Sealevel Systems, Inc. SeaConn…
    CVE-2021-21960 (CVSS 10) — A stack-based buffer overflow vulnerability exists in both the LLMNR functionality of Sealevel Systems, Inc. S…
    CVE-2021-21963 (CVSS 5.9) — An information disclosure vulnerability exists in the Web Server functionality of Sealevel Systems, Inc. SeaCo…
    CVE-2021-21971 (CVSS 5.9) — An out-of-bounds write vulnerability exists in the URL_decode functionality of Sealevel Systems, Inc. SeaConne…

    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