libzmq5: An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3
CVE-2021-20237 is fixed in libzmq5 on 1 platform, first by libzmq5 4.2.5-1ubuntu0.2+esm2, released May 28, 2021. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libzmq5 · Ubuntu 18.04.6 LTS (bionic) | 4.2.5-1ubuntu0.2+esm2 | libzmq5 4.2.5-1ubuntu0.2+esm2 | May 28, 2021 |
| libzmq5 · Ubuntu 20.04 LTS (focal) | 4.3.2-2ubuntu1.20.04.1~esm2 | libzmq5 4.3.2-2ubuntu1.20.04.1~esm2 | May 28, 2021 |
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