This security advisory describes one medium risk vulnerability.
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]
Exploit availability: NoDescription
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.
Install update from vendor's website.Vulnerable software versions
Eclipse Mosquitto: 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9CPE
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.