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CVE-2019-6250

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

8.8 HighPublic exploitFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

9.70%Up 7.9 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.8

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).

Record
CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
9.0 HighAV:N/AC:L/Au:S/C:C/I:C/A:C
Weakness
CWE-190
Updated
2026-11-02
CVE List No score

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).

Record
CVE-2019-6250
Updated
2026-11-02
EUVDEUVD-2019-15817 No score

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).

Record
EUVD-2019-15817
Updated
2026-11-03
GitHub AdvisoriesGHSA-383h-xx34-hq84 8.8

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

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).

Record
GHSA-383h-xx34-hq84
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-190
Updated
2026-11-02
OSVALPINE-CVE-2019-6250 8.8

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).

Record
ALPINE-CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBELL-CVE-2019-6250 8.8

CVE-2019-6250 does not affect BellSoft software

Record
BELL-CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 12 moreShow less
OSV 8.8

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).

Record
CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-6250 8.8

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).

Record
DEBIAN-CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2019-6250 8.8

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).

Record
UBUNTU-CVE-2019-6250
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2019-0054 No score

Updated zeromq packages fix security vulnerability

CVE-2019-6250: fix a remote execution vulnerability due to pointer arithmetic overflow

Record
MGASA-2019-0054
Updated
2026-11-02
OSVopenSUSE-SU-2019:0087-1 No score

Security update for zeromq

This update for zeromq fixes the following issues:

Security issue fixed:

  • CVE-2019-6250: fix a remote execution vulnerability due to pointer arithmetic overflow (bsc#1121717)

The following tracked packaging change is included:

  • boo1082318: correctly mark license files as licence instead of documentation.

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:0087-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11264-1 No score

python36-pyzmq-22.2.1-1.4 on GA media

These are all security issues fixed in the python36-pyzmq-22.2.1-1.4 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11264-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11540-1 No score

libzmq5-32bit-4.3.4-2.2 on GA media

These are all security issues fixed in the libzmq5-32bit-4.3.4-2.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11540-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:13821-1 No score

python310-pyzmq-25.1.2-2.1 on GA media

These are all security issues fixed in the python310-pyzmq-25.1.2-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:13821-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:11459-1 No score

python313-pyzmq-27.1.0-3.1 on GA media

These are all security issues fixed in the python313-pyzmq-27.1.0-3.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11459-1
Updated
2026-11-02
OSVSUSE-FU-2022:0444-1 No score

Feature update for venv-salt-minion

This feature update for venv-salt-minion provides the following changes:

  • Introduce venv-salt-minion.
  • Track already fixed issues.
Record
SUSE-FU-2022:0444-1
Updated
2026-11-02
OSVSUSE-FU-2022:0445-1 No score

Feature update for venv-salt-minion

This feature update for venv-salt-minion provides the following changes:

  • Introduce venv-salt-minion.
  • Mention fixed issues provided with the bundle.
Record
SUSE-FU-2022:0445-1
Updated
2026-11-02
OSVSUSE-SU-2019:0110-1 No score

Security update for zeromq

This update for zeromq fixes the following issues:

Security issue fixed:

  • CVE-2019-6250: fix a remote execution vulnerability due to pointer arithmetic overflow (bsc#1121717)
Record
SUSE-SU-2019:0110-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
zeromq
Alpine:v3.10
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.11
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.12
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.13
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.14
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.15
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.16
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.17
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.18
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.19
before 4.3.1-r0
4.3.1-r0
Show 18 moreShow less
Affected packages
PackageAffectedFixed
zeromq
Alpine:v3.20
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.21
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.22
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.23
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.24
before 4.3.1-r0
4.3.1-r0
zeromq
Alpine:v3.6
before 4.2.5-r0
4.2.5-r0
zeromq
Alpine:v3.7
before 4.2.5-r0
4.2.5-r0
zeromq
Alpine:v3.8
before 4.2.5-r0
4.2.5-r0
zeromq
Alpine:v3.9
before 4.3.1-r0
4.3.1-r0
zeromq3
Debian:12
before 4.3.1-1
4.3.1-1
zeromq3
Debian:13
before 4.3.1-1
4.3.1-1
zeromq3
Debian:14
before 4.3.1-1
4.3.1-1
zeromq3
Debian:9
before 4.2.1-4+deb9u1, plus listed versions
4.2.1-4
4.2.1-4+deb9u1
zeromq
Mageia:6
before 4.2.2-1.1.mga6
4.2.2-1.1.mga6
zeromq
SUSE:Linux Enterprise Module for Basesystem 15
before 4.2.3-3.3.2
4.2.3-3.3.2
zeromq3
Ubuntu:18.04:LTS
before 4.2.5-1ubuntu0.1, plus listed versions
4.2.1-4ubuntu14.2.2-1ubuntu24.2.3-14.2.3-1build14.2.5-1
4.2.5-1ubuntu0.1
zeromq
openSUSE:Tumbleweed
From an advisory covering 3 CVEs
before 4.3.4-2.2
4.3.4-2.2
python-pyzmq
openSUSE:Tumbleweed
before 27.1.0-3.1
27.1.0-3.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubAkashicYiTai/CVE-2019-6250-libzmq2024-06-20
PoC in GitHubdinosn/cve-2019-6250-lab2026-05-03

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-6250 is a high vulnerability (CVSS 8.8) in Zeromq Libzmq, published January 13, 2019. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 9.70%, the 95th percentile. Fixed in zeromq 4.3.1-r0.

References

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