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VULNERABILITIES

CVE-2021-20237 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1921989 CVEIssue TrackingThird Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw CVEPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1921989 [email protected]Issue TrackingThird Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw [email protected]PatchThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-401Missing Release of Memory after Effective Lifetime[email protected]
CWE-400Uncontrolled Resource Consumption[email protected]

Affected Products

ProductVersions
zeromq libzmq
>= 4.2.0, < 4.3.3

CPE

  • cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-20237
NVD Published Date:
May 28, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-20237 Details - Not Deferred