CVE-2023-5632

NameCVE-2023-5632
DescriptionIn 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
SourceCVE (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 PackageReleaseVersionStatus
mosquitto (PTS)jessie, jessie (lts)1.3.4-2+deb8u4fixed
stretch (security), stretch (lts), stretch1.4.10-3+deb9u5fixed
buster (security), buster, buster (lts)1.5.7-1+deb10u1fixed
bullseye (security), bullseye2.0.11-1+deb11u1fixed
bookworm (security), bookworm2.0.11-1.2+deb12u1fixed
sid, trixie2.0.20-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mosquittosourcejessie(not affected)
mosquittosourcestretch(not affected)
mosquittosourcebuster(not affected)
mosquittosource(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)
[stretch] - mosquitto <not-affected> (The vulnerable code was introduced later)
[jessie] - mosquitto <not-affected> (The vulnerable code was introduced later)

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