A zeromq3 security update has been released for Debian GNU/Linux 10 to address a denial of service issue.

DSA 4761-1: zeromq3 security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4761-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
September 07, 2020   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : zeromq3
CVE ID : CVE-2020-15166

It was discovered that ZeroMQ, a lightweight messaging kernel library
does not properly handle connecting peers before a handshake is
completed. A remote, unauthenticated client connecting to an application
using the libzmq library, running with a socket listening with CURVE
encryption/authentication enabled can take advantage of this flaw to
cause a denial of service affecting authenticated and encrypted clients.

For the stable distribution (buster), this problem has been fixed in
version 4.3.1-4+deb10u2.

We recommend that you upgrade your zeromq3 packages.

For the detailed security status of zeromq3 please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/zeromq3

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/