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Fencer Vulns
high 8.8

CVE-2019-6250 json

A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x and 4.3.x before 4.3.1.

published 2019-01-13 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-15817

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.7%
EPSS 9.7% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x and 4.3.x before 4.3.1. A v2_decoder.cpp zmq::v2_decoder_t::size_ready integer overflow allows an authenticated attacker to overwrite an arbitrary amount of bytes beyond the bounds of a buffer, which can be leveraged to run arbitrary code on the target system. The memory layout allows the attacker to inject OS commands into a data structure located immediately after the problematic buffer (i.e., it is not necessary to use a typical buffer-overflow exploitation technique that changes the flow of control).

Patch / fix

  • zeromq libzmq 4.3.1
  • zeromq3 Debian 14, Debian 13, Debian 12 4.3.1-1

debian advisories DEBIAN-CVE-2019-6250

  • zeromq3 Ubuntu 18.04 LTS 4.2.5-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2019-6250

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zeromq SLE Module for Basesystem 15 4.2.3-3.3.2

suse advisories SUSE-SU-2019:0110-1

  • python-pyzmq openSUSE Tumbleweed 27.1.0-3.1
  • zeromq openSUSE Tumbleweed 4.3.4-2.2

opensuse advisories openSUSE-SU-2026:11459-1openSUSE-SU-2024:11540-1

  • zeromq Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 4.3.1-r0
  • zeromq Alpine 3.8, Alpine 3.7, Alpine 3.6 4.2.5-r0

alpine advisories ALPINE-CVE-2019-6250

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-6250 updated cvss 8.8

zeromq: Integer overflow in zmq::v2_decoder_t::size_ready

  • Red Hat Ceph Storage 2 zeromq3
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

9.70% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/zeromq/libzmq/issues/3351 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.