What is CVE-2021-20237?

CVE-2021-20237 is a high-severity vulnerability in Zeromq Libzmq, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-05-28.

How severe is CVE-2021-20237?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Zeromq Libzmq

CVE-2021-20237

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.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.017 (74.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Zeromq Libzmq
N/a Zeromq — versions zeromq 4.3.3

Weakness classification (CWE)

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-20237?: CVE-2021-20237 is a high-severity vulnerability in Zeromq Libzmq, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-05-28.
How severe is CVE-2021-20237?: High severity. CVSS v3 base score is 7.5 out of 10.