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Vulnerability · Published May 28, 2021 · Assigned by redhat

CVE-2021-20237

High 7.5

In plain English

A high-severity uncontrolled resource consumption in zeromq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.7%top 22.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12zeromq34.3.3-1DEBIAN-CVE-2021-20237
Debian:13zeromq34.3.3-1DEBIAN-CVE-2021-20237
Debian:14zeromq34.3.3-1DEBIAN-CVE-2021-20237

Affected products (as reported)

VendorProductVersions
n/a zeromq zeromq 4.3.3

Weakness: CWE-400

References