What is CVE-2021-21964?

CVE-2021-21964 is a high-severity vulnerability in Sealevel Seaconnect 370w, classified under Improper Access Control. CVSS score: 7.4/10. Published 2022-02-04.

How severe is CVE-2021-21964?

High severity. CVSS v3 base score is 7.4 out of 10.

Auth bypass in Sealevel Seaconnect 370w

CVE-2021-21964

A denial of service vulnerability exists in the Modbus configuration functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. Specially-crafted network packets can lead to denial of service. An attacker can send a malicious packet to trigger this vulnerability.

Published 2022-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · 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-2021-1392 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21964?: CVE-2021-21964 is a high-severity vulnerability in Sealevel Seaconnect 370w, classified under Improper Access Control. CVSS score: 7.4/10. Published 2022-02-04.
How severe is CVE-2021-21964?: High severity. CVSS v3 base score is 7.4 out of 10.