Descriptionstream_engine.cpp in libzmq (aka ZeroMQ/C++)) 4.0.5 before 4.0.5 allows man-in-the-middle attackers to conduct downgrade attacks via a crafted connection request.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
zeromq3 (PTS)stretch4.2.1-4+deb9u2fixed
stretch (security)4.2.1-4+deb9u4fixed
buster, buster (security)4.3.1-4+deb10u2fixed
bullseye, sid4.3.4-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
zeromqsource(unstable)(not affected)


- zeromq <not-affected> (Vulnerable code not present, only zmq 4.x onwards)
Code commit:

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