Buffer overflow in Sealevel Seaconnect 370w
CVE-2021-21970
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Sealevel Seaconnect 370w
- Sealevel Seaconnect 370w Firmware — versions 1.3.34
- Sealevel — versions Sealevel Systems, Inc. SeaConnect 370W v1.3.34
Weakness classification (CWE)
References
- talosintelligence.com/vulnerability_reports/TALOS-2021-1396 (Technical Description, Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21970?
- CVE-2021-21970 is a high-severity vulnerability in Sealevel Seaconnect 370w, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.1/10. Published 2022-02-04.
- How severe is CVE-2021-21970?
- High severity. CVSS v3 base score is 8.1 out of 10.