Vulnerability Details CVE-2021-21969
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 60.8%
CVSS Severity
CVSS v3 Score 3.7
CVSS v2 Score 6.8
References
Products affected by CVE-2021-21969
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cpe:2.3:h:sealevel:seaconnect_370w:-
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cpe:2.3:o:sealevel:seaconnect_370w_firmware:1.3.34