CVE-2021-21971

Public Exploit

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.40%
Third-Party Advisory talosintelligence.com Third-Party Advisory talosintelligence.com
Affected: n/a Sealevel
Published at:
Updated at:

References

Link Tags
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1406 third party advisory not applicable
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1397 exploit technical description third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-21971?
CVE-2021-21971 has been scored as a medium severity vulnerability.
How to fix CVE-2021-21971?
To fix CVE-2021-21971, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-21971 being actively exploited in the wild?
It is possible that CVE-2021-21971 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21971?
CVE-2021-21971 affects n/a Sealevel.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.