CVE-2021-21959 describes a critical misconfiguration in the MQTTS functionality of Sealevel Systems SeaConnect 370W v1.3.34, which significantly simplifies man-in-the-middle attacks. This vulnerability carries a high CVSS score of 8.1, indicating high impact on confidentiality, integrity, and availability, and can lead to full device control with high attack complexity but no user interaction required. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media coverage, including an article from SecurityWeek highlighting its impact on ICS environments.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
1.3.34CPE matchmatch criteria | cpe:2.3:o:sealevel:seaconnect_370w_firmware:1.3.34:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.