CVE-2021-20234
First published: Fri Jan 29 2021(Updated: )
A flaw was found in zeromq before 4.3.3. When a pipe processes a delimiter and is already not in active state but still has an unfinished message, the message is leaked causing a crash. References: <a href="https://github.com/zeromq/libzmq/pull/3918">https://github.com/zeromq/libzmq/pull/3918</a> <a href="https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87">https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87</a> <a href="https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22037">https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22037</a> <a href="https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22123">https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22123</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ZeroMQ libzmq | <4.3.3 | |
| redhat/zeromq | <4.3.3 | 4.3.3 |
| debian/zeromq3 | 4.3.4-1+deb11u1 4.3.4-6 4.3.5-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1921972
- https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87
- https://launchpad.net/bugs/cve/CVE-2021-20234
- https://github.com/zeromq/libzmq/pull/3918
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22037
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22123
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921973
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921975
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921974
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921978
- https://bodhi.fedoraproject.org/updates/FEDORA-2021-a01e258e6d
- https://security-tracker.debian.org/tracker/CVE-2021-20234
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20234
- https://nvd.nist.gov/vuln/detail/CVE-2021-20234
- https://ubuntu.com/security/CVE-2021-20234
Frequently Asked Questions
What is CVE-2021-20234?
CVE-2021-20234 is an uncontrolled resource consumption (memory leak) vulnerability in the ZeroMQ client.
What is the severity of CVE-2021-20234?
The severity of CVE-2021-20234 is medium with a CVSS score of 6.5.
Which software versions are affected by CVE-2021-20234?
Versions before 4.3.3 of the ZeroMQ client are affected.
How does CVE-2021-20234 impact system availability?
CVE-2021-20234 can cause a system to crash if a client connects to multiple malicious or compromised servers.
How can I fix CVE-2021-20234?
To fix CVE-2021-20234, upgrade to version 4.3.3-1 of the ZeroMQ client.
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