NULL pointer dereference in Eclipse Mosquitto - CVE-2021-28166
Published: April 8, 2021
Vulnerability identifier: #VU51973
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-2021-28166
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in Eclipse Mosquitto when processing CONNACK messages. A remote authenticated user connected with MQTT v5 can send a specially crafted CONNACK message to the broker, trigger a NULL pointer dereference error and crash the service.
Affected software
Eclipse Mosquitto
Fedora
mosquitto
Fedora
mosquitto
How to mitigate CVE-2021-28166
Install update from vendor's website.
Eclipse Mosquitto - update to 2.0.10
mosquitto - update to 1.6.15-1.el8
mosquitto - update to 1.6.15-1.el8