CVE-2021-21959 | BDVDB-2026-169129 Detail

Sealevel

Description#

A misconfiguration exists in the MQTTS functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. This misconfiguration significantly simplifies a man-in-the-middle attack, which directly leads to control of device functionality.

Impact#

Per CVSS v3.0: confidentiality impact low, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-295 Improper Certificate Validation

References#

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1388

Exploit#

No public exploit known

History#

Version 12022-02-04Record published in the CVE List.
Version 22025-04-15Most recent update recorded in the CVE List.

Published

Published: 2022-02-04
Last modified: 2025-04-15

Vendor information

Vendor: Not stated
Product: Sealevel

Score

7.7 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 58.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
Sealevel Systems, Inc. SeaConnect 370W v1.3.34
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

Not available

CVSS v3.0

7.7 High

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	High
Availability	High

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).