VULNERABILITY INTELLIGENCE

CVE-2021-21971

CVSS score5.9 MEDIUM

EPSS probability0.70%

CISA KEVNot currently listed

Published2022-02-04

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Description

An out-of-bounds write vulnerability exists in the URL_decode functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted MQTT payload can lead to an out-of-bounds write. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.

Weakness classification

talos-cna@cisco.com: CWE-787
nvd@nist.gov: CWE-787

Primary references

talos-cna@cisco.com — Not Applicable, Third Party Advisory
nvd@nist.gov — Exploit, Technical Description, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Not Applicable, Third Party Advisory