What’s Vulnerable › Vulnerabilities

CVE-2021-41039

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-01 · updated 2026-06-17
• Weakness: CWE-1050

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.

Affected products

• The Eclipse Foundation Eclipse Mosquitto: from 1.6 through 2.0.11

References

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314
• https://www.debian.org/security/2023/dsa-5511
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314
• https://www.debian.org/security/2023/dsa-5511

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