---
title: "CVE-2019-20925\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-2019-20925?format=md
keywords: index, follow
---

# CVE-2019-20925

Publication date 24 November 2020

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2019-20925?format=md#impact-score)

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## Description

An unauthenticated client can trigger denial of service by issuing
specially crafted wire protocol messages, which cause the message
decompressor to incorrectly allocate memory. This issue affects MongoDB
Server v4.2 versions prior to 4.2.1; MongoDB Server v4.0 versions prior to
4.0.13; MongoDB Server v3.6 versions prior to 3.6.15 and MongoDB Server
v3.4 versions prior to 3.4.24.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-20925?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mongodb | 23.04 lunar | Not in release |
| 22.10 kinetic | Not in release |
| 22.04 LTS jammy | Not in release |
| 21.10 impish | Not in release |
| 21.04 hirsute | Not in release |
| 20.10 groovy | Not in release |
| 20.04 LTS focal | Fixed 1:3.6.9+really3.6.8+90~g8e540c0b6d-0ubuntu5.3 |
| 18.04 LTS bionic | Fixed 1:3.6.3-0ubuntu1.4 |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2019-20925?format=md#patch-details)

## Notes

---

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

Introduced by https://github.com/mongodb/mongo/commit/91800fc61913358350b658406065c5d893d2ba2c

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| mongodb | * Upstream:   [c1a956e](https://github.com/mongodb/mongo/commit/c1a956e084d39e6da75cd347e63d0064ed9151a8) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20925)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-20925)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-20925)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-20925)

### Related Ubuntu Security Notices (USN)

+ [USN-5101-1](https://usn.ubuntu.com/USN-5101-1)
+ MongoDB vulnerability
+ 4 October 2021

### Other references

* <https://jira.mongodb.org/browse/SERVER-43751>
* <https://www.cve.org/CVERecord?id=CVE-2019-20925>