CVE-2021-20235: Buffer Overflow
First published: Fri Jan 29 2021(Updated: )
A flaw was found in zeromq before 4.3.3. The use of a static allocator with ZMTP v1 packets may lead to a heap based overflow. References: <a href="https://github.com/zeromq/libzmq/pull/3902">https://github.com/zeromq/libzmq/pull/3902</a> <a href="https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6">https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6</a> <a href="https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21984">https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21984</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ZeroMQ libzmq | >=4.2.0<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=1921983
- https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6
- https://launchpad.net/bugs/cve/CVE-2021-20235
- https://github.com/zeromq/libzmq/pull/3902
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21984
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921985
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921987
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921986
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921984
- https://bodhi.fedoraproject.org/updates/FEDORA-2021-a01e258e6d
- https://security-tracker.debian.org/tracker/CVE-2021-20235
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20235
- https://nvd.nist.gov/vuln/detail/CVE-2021-20235
- https://ubuntu.com/security/CVE-2021-20235
Frequently Asked Questions
What is the vulnerability ID for this flaw in the zeromq server?
The vulnerability ID is CVE-2021-20235.
What is the severity of CVE-2021-20235?
The severity of CVE-2021-20235 is high, with a severity value of 8.1.
What is the affected software for CVE-2021-20235?
The affected software for CVE-2021-20235 includes versions before 4.3.3 of zeromq server.
How can an attacker exploit CVE-2021-20235?
A remote, unauthenticated attacker can exploit CVE-2021-20235 by sending a crafted request to the zeromq server.
Where can I find more information about CVE-2021-20235?
You can find more information about CVE-2021-20235 on the CVE Mitre website.
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