https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-21967.htmlhttps://patchthecve.com/cve/CVE-2021-21967.htmlWed, 17 Jun 2026 03:36:28 +0000MEDIUM 5.9: An out-of-bounds write vulnerability exists in the OTA update task functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted MQTT payload can lead to denial of service. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21971.htmlhttps://patchthecve.com/cve/CVE-2021-21971.htmlWed, 17 Jun 2026 03:36:28 +0000MEDIUM 5.9: An out-of-bounds write vulnerability exists in the URL_decode functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted MQTT payload can lead to an out-of-bounds write. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21970.htmlhttps://patchthecve.com/cve/CVE-2021-21970.htmlWed, 17 Jun 2026 03:36:28 +0000HIGH 8.1: 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 [3] the json_object_get_string to populate the p_name global variable. The p_name is only 0x80 bytes long, and https://patchthecve.com/cve/CVE-2021-21969.htmlhttps://patchthecve.com/cve/CVE-2021-21969.htmlWed, 17 Jun 2026 03:36:28 +0000HIGH 8.1: 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 lonhttps://patchthecve.com/cve/CVE-2021-21968.htmlhttps://patchthecve.com/cve/CVE-2021-21968.htmlWed, 17 Jun 2026 03:36:28 +0000HIGH 8.3: A file write vulnerability exists in the OTA update task functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted MQTT payload can lead to arbitrary file overwrite. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21965.htmlhttps://patchthecve.com/cve/CVE-2021-21965.htmlWed, 17 Jun 2026 03:36:27 +0000CRITICAL 9.3: A denial of service vulnerability exists in the SeaMax remote configuration functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. Specially-crafted network packets can lead to denial of service. An attacker can send a malicious packet to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21964.htmlhttps://patchthecve.com/cve/CVE-2021-21964.htmlWed, 17 Jun 2026 03:36:27 +0000HIGH 7.4: A denial of service vulnerability exists in the Modbus configuration functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. Specially-crafted network packets can lead to denial of service. An attacker can send a malicious packet to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21963.htmlhttps://patchthecve.com/cve/CVE-2021-21963.htmlWed, 17 Jun 2026 03:36:27 +0000MEDIUM 5.9: An information disclosure vulnerability exists in the Web Server functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted man-in-the-middle attack can lead to a disclosure of sensitive information. An attacker can perform a man-in-the-middle attack to trigger this vulnerahttps://patchthecve.com/cve/CVE-2021-21962.htmlhttps://patchthecve.com/cve/CVE-2021-21962.htmlWed, 17 Jun 2026 03:36:26 +0000HIGH 8.1: A heap-based buffer overflow vulnerability exists in the OTA Update u-download functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A series of specially-crafted MQTT payloads can lead to remote code execution. An attacker must perform a man-in-the-middle attack in order to trigger this https://patchthecve.com/cve/CVE-2021-21961.htmlhttps://patchthecve.com/cve/CVE-2021-21961.htmlWed, 17 Jun 2026 03:36:26 +0000CRITICAL 10.0: A stack-based buffer overflow vulnerability exists in the NBNS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted network packet can lead to remote code execution. An attacker can send a malicious packet to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21960.htmlhttps://patchthecve.com/cve/CVE-2021-21960.htmlWed, 17 Jun 2026 03:36:26 +0000CRITICAL 10.0: A stack-based buffer overflow vulnerability exists in both the LLMNR functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted network packet can lead to remote code execution. An attacker can send a malicious packet to trigger this vulnerability.https://patchthecve.com/cve/CVE-2021-21959.htmlhttps://patchthecve.com/cve/CVE-2021-21959.htmlWed, 17 Jun 2026 03:36:26 +0000HIGH 8.1: A misconfiguration exists in the MQTTS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. This misconfiguration significantly simplifies a man-in-the-middle attack, which directly leads to control of device functionality.