Input validation error in Eclipse Mosquitto - CVE-2021-34432

Vulnerability identifier: #VU56021

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-34432

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user can send a PUBLISH packet with topic length = 0 and perform a denial of service (DoS) attack.

Eclipse Mosquitto
IBM App Connect Enterprise
openEuler
mosquitto
mosquitto-debugsource
mosquitto-debuginfo
mosquitto-devel

Install updates from vendor's website.

Eclipse Mosquitto - update to 2.0.8
mosquitto - update to 1.6.15-6
mosquitto-debugsource - update to 1.6.15-6
mosquitto-debuginfo - update to 1.6.15-6
mosquitto-devel - update to 1.6.15-6

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=574141

• Denial of service in Eclipse Mosquitto
• Multiple vulnerabilities in IBM App Connect Enterprise
• openEuler update for mosquitto
• openEuler 22.03 LTS update for mosquitto