Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zeromq | Libzmq | >= 4.2.0, < 4.3.3 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921989Issue TrackingThird Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxwPatchThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1921989Issue TrackingThird Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxwPatchThird Party Advisory
FAQ
What is CVE-2021-20237?
CVE-2021-20237 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 tha...
How severe is CVE-2021-20237?
CVE-2021-20237 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-20237?
Check the references section above for vendor advisories and patch information. Affected products include: Zeromq Libzmq.