CVE-2021-21967: Sealevel Seaconnect 370w Firmware

Medium severity, CVSS 5.9. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Sealevel Seaconnect 370w Firmware: version 1.3.34 only

Published 2022-04-14. Last modified 2026-06-17.