---
title: "CVE-2019-6250\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-6250?format=md
keywords: index, follow
---

# CVE-2019-6250

Publication date 13 January 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2019-6250?format=md#impact-score)

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## Description

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).

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-6250?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| zeromq3 | 18.10 cosmic | Fixed 4.2.5-2ubuntu0.1 |
| 18.04 LTS bionic | Fixed 4.2.5-1ubuntu0.1 |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [ebarretto](https://launchpad.net/~ebarretto)

Vulnerable code introduce in 4.2.0

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6250)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-6250)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-6250)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-6250)

### Other references

* <https://github.com/zeromq/libzmq/issues/3351>
* <https://github.com/zeromq/libzmq/releases/tag/v4.3.1>
* <https://www.cve.org/CVERecord?id=CVE-2019-6250>