CVE-2023-5632

Name	CVE-2023-5632
Description	In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mosquitto (PTS)	bullseye (security), bullseye	2.0.11-1+deb11u1	fixed
	bookworm, bookworm (security)	2.0.11-1.2+deb12u1	fixed
	sid, trixie	2.0.20-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mosquitto	source	buster	(not affected)
mosquitto	source	(unstable)	2.0.7-1

Notes

[buster] - mosquitto <not-affected> (The vulnerable code was introduced later)
https://github.com/eclipse/mosquitto/pull/2053
https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d (v2.0.6)