CVE-2021-20236: Buffer Overflow
First published: Fri Jan 29 2021(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/zeromq | <4.3.3 | 4.3.3 |
| Zeromq Zeromq | <4.3.3 | |
| Redhat Ceph Storage | =2.0 | |
| Redhat Enterprise Linux | =7.0 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- https://github.com/zeromq/libzmq/pull/3959
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22488
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921979
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921981
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921980
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921977
- https://bodhi.fedoraproject.org/updates/FEDORA-2021-a01e258e6d
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976
Frequently Asked Questions
What is CVE-2021-20236?
CVE-2021-20236 is a vulnerability found in the ZeroMQ server in versions before 4.3.3.
How does CVE-2021-20236 affect confidentiality and integrity?
CVE-2021-20236 can potentially compromise the confidentiality and integrity of a system.
What is the severity of CVE-2021-20236?
CVE-2021-20236 has a severity score of 9.8 (critical).
What software versions are affected by CVE-2021-20236?
Versions of ZeroMQ before 4.3.3 are affected by CVE-2021-20236.
Are there any known fixes or mitigations for CVE-2021-20236?
Yes, the fix for CVE-2021-20236 is to update to version 4.3.3 of ZeroMQ or later.
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