Arch Linux Security Advisory ASA-201810-1 ========================================= Severity: Medium Date : 2018-10-01 CVE-ID : CVE-2018-12543 Package : mosquitto Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-772 Summary ======= The package mosquitto before version 1.5.3-1 is vulnerable to denial of service. Resolution ========== Upgrade to 1.5.3-1. # pacman -Syu "mosquitto>=1.5.3-1" The problem has been fixed upstream in version 1.5.3. Workaround ========== None. Description =========== If a message is sent to Mosquitto before 1.5.3 with a topic that begins with $, but is not $SYS, then an assert that should be unreachable is triggered and Mosquitto will exit. Impact ====== A remote attacker is able to cause a denial of service by sending a specially crafted mqtt message. References ========== https://mosquitto.org/blog/2018/09/security-advisory-cve-2018-12543/ https://github.com/eclipse/mosquitto/commit/f7474d348225bf086f6b9c69b18d6413... https://security.archlinux.org/CVE-2018-12543