CVE-2021-41039

Public Exploit

Description

In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.22%
Vendor Advisory debian.org Vendor Advisory eclipse.org
Affected: The Eclipse Foundation Eclipse Mosquitto
Published at:
Updated at:

References

Link Tags
https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314 patch exploit vendor advisory issue tracking
https://www.debian.org/security/2023/dsa-5511 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-41039?
CVE-2021-41039 has been scored as a high severity vulnerability.
How to fix CVE-2021-41039?
To fix CVE-2021-41039, 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-2021-41039 being actively exploited in the wild?
It is possible that CVE-2021-41039 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-2021-41039?
CVE-2021-41039 affects The Eclipse Foundation Eclipse Mosquitto.
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.