Critical severity9.8NVD Advisory· Published May 28, 2021· Updated Jun 17, 2026
CVE-2021-20236
CVE-2021-20236
Description
A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
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Affected products
6- cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- ZeroMQ/ZeroMQ serverdescription
Patches
Vulnerability mechanics
References
2- github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8nvdPatchThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
News mentions
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