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Vulnerability · Published Sep 11, 2020 · Assigned by GitHub_M

CVE-2020-15166Denial of Service in ZeroMQ

High 7.5

In plain English

A high-severity uncontrolled resource consumption in libzmq from zeromq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 89% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)3.3%top 11.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In ZeroMQ before version 4.3.3, there is a denial-of-service vulnerability. Users with TCP transport public endpoints, even with CURVE/ZAP enabled, are impacted. If a raw TCP socket is opened and connected to an endpoint that is fully configured with CURVE/ZAP, legitimate clients will not be able to exchange any message. Handshakes complete successfully, and messages are delivered to the library, but the server application never receives them. This is patched in version 4.3.3.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20zeromq4.3.3-r0ALPINE-CVE-2020-15166
Alpine:v3.21zeromq4.3.3-r0ALPINE-CVE-2020-15166
Alpine:v3.22zeromq4.3.3-r0ALPINE-CVE-2020-15166
Alpine:v3.23zeromq4.3.3-r0ALPINE-CVE-2020-15166
Alpine:v3.24zeromq4.3.3-r0ALPINE-CVE-2020-15166
Debian:12zeromq34.3.3-1DEBIAN-CVE-2020-15166
Debian:13zeromq34.3.3-1DEBIAN-CVE-2020-15166
Debian:14zeromq34.3.3-1DEBIAN-CVE-2020-15166

Affected products (as reported)

VendorProductVersions
zeromq libzmq < 4.3.3

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References