CVE-2020-15166

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
zeromq	libzmq	< 4.3.3

References

https://github.com/zeromq/libzmq/pull/3913Patch, Third Party Advisory
https://github.com/zeromq/libzmq/pull/3973Patch, Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938mPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00017.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZ5IMNQXDB52JFBXHFLK4AHVORFELNNG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YFW2ZELCCPS4VLU4OSJOH5YL6KFKTFYW/
https://security.gentoo.org/glsa/202009-12Third Party Advisory
https://github.com/zeromq/libzmq/pull/3913Patch, Third Party Advisory
https://github.com/zeromq/libzmq/pull/3973Patch, Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938mPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00017.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZ5IMNQXDB52JFBXHFLK4AHVORFELNNG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YFW2ZELCCPS4VLU4OSJOH5YL6KFKTFYW/
https://security.gentoo.org/glsa/202009-12Third Party Advisory

Timeline

Published: Sep 11, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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