CVE-2021-21967 - CVE House
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Status published Medium CVE-2021-21967

An out-of-bounds write vulnerability exists in the OTA update task...

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

Affected Vendor

Sealevel Systems, Inc.

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Affected Software

SeaConnect 370W
Vulnerable Versions:
v1.3.34

Timeline

Official Publish: April 14th, 2022
Last Modified: April 15th, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Weaknesses (CWE)

CWE-120

MITRE ATT&CK TTPs

T1203 Exploitation for Client Execution
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control