Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zeromq | Zeromq | < 4.3.3 |
| Redhat | Ceph Storage | 2.0 |
| Redhat | Enterprise Linux | 7.0 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976Issue TrackingThird Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8PatchThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1921976Issue TrackingThird Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8PatchThird Party Advisory
FAQ
What is CVE-2021-20236?
CVE-2021-20236 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 th...
How severe is CVE-2021-20236?
CVE-2021-20236 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-20236?
Check the references section above for vendor advisories and patch information. Affected products include: Zeromq Zeromq, Redhat Ceph Storage, Redhat Enterprise Linux, Fedoraproject Fedora.