High severity7.5NVD Advisory· Published May 28, 2021· Updated Jun 17, 2026
CVE-2021-20237
CVE-2021-20237
Description
An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.
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Affected products
2Patches
Vulnerability mechanics
References
2- github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxwnvdPatchThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
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