CVE-2021-21969 - CVE House
Back to Database
Status published Low CVE-2021-21969

An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of...

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

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

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21969

Credits & Attribution

No credits recorded in the NVD database.

Affected Vendor

Affected Software

Sealevel"
Vulnerable Versions:
Sealevel Systems, Inc. SeaConnect 370W v1.3.34

Timeline

Official Publish: February 4th, 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:N

Weaknesses (CWE)