Sealevel manufactures industrial serial communication and connectivity hardware, with vulnerabilities concentrated in its SeaConnect product line and associated firmware. The vendor's disclosures skew toward serious outcomes, with a meaningful share reaching critical severity and clustering around memory-safety weaknesses—out-of-bounds writes, buffer overflows (stack and heap variants), and improper access control—that are characteristic of embedded systems firmware lacking modern defensive compilation practices. Defenders should inventory affected devices in industrial and legacy network environments and apply firmware updates as part of routine embedded-systems patching; live severity, exploitation, and exposure counts are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Sealevel over time
Signals from CVEs in this vendor scope (12 CVEs).
12 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2021-21961CRITICAL 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 remot | Feb 4, 2022 | 10.0 | 33 | NO | NO |
CVE-2021-21960CRITICAL 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 | Feb 4, 2022 | 10.0 | 32 | NO | NO |
CVE-2021-21965CRITICAL 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 l | Feb 4, 2022 | 9.3 | 29 | NO | NO |
CVE-2021-21968HIGH 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 fil | Feb 4, 2022 | 8.3 | 27 | NO | NO |
CVE-2021-21962HIGH 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 p | Feb 4, 2022 | 8.1 | 27 | NO | NO |
CVE-2021-21970HIGH An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. The HandleIncomingSeaCloudMessage function | Feb 4, 2022 | 8.1 | 26 | NO | NO |
CVE-2021-21969HIGH An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. The HandleIncomingSeaCloudMessage function | Feb 4, 2022 | 8.1 | 26 | NO | NO |
CVE-2021-21959HIGH 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, w | Feb 4, 2022 | 8.1 | 26 | NO | NO |
CVE-2021-21964HIGH 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 | Feb 4, 2022 | 7.4 | 25 | NO | NO |
CVE-2021-21971MEDIUM 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-o | Feb 4, 2022 | 5.9 | 22 | NO | NO |
Signals from CVEs in this vendor scope (12 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Sealevel.
Media articles that mention a CVE ID that affects a product developed by Sealevel — matched by CVE ID, not by vendor name.