Vulnerability · Published Feb 4, 2022 · Assigned by talos

CVE-2021-21970

Low 3.7

In plain English

A low-severity buffer overflow in Sealevel. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.0)3.7Low

Exploit odds (30 days)0.9%top 40.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 [3] the json_object_get_string to populate the p_name global variable. The p_name is only 0x80 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.

Affected products (as reported)

Vendor	Product	Versions
n/a	Sealevel	Sealevel Systems, Inc. SeaConnect 370W v1.3.34

Weakness: CWE-120 · Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396 x_refsource_MISC