---
title: "CVE-2020-7929\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-2020-7929?format=md
keywords: index, follow
---

# CVE-2020-7929

Publication date 1 March 2021

Last updated 18 February 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2020-7929?format=md#impact-score)

Toggle side navigation

## Description

A user authorized to perform database queries may trigger denial of service
by issuing specially crafted query contain a type of regex. This issue
affects MongoDB Server v3.6 versions prior to 3.6.21 and MongoDB Server
v4.0 versions prior to 4.0.20.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2020-7929?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mongodb | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 25.04 plucky | Not in release |
| 24.10 oracular | Not in release |
| 24.04 LTS noble | Not in release |
| 23.10 mantic | Not in release |
| 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 | Vulnerable, fix deferred |
| 18.04 LTS bionic | Vulnerable, fix deferred |
| 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-2020-7929?format=md#patch-details)

## Notes

---

### [john-breton](https://launchpad.net/~john-breton)

Patches were released after the switch to SSPL upstream,
as such we cannot use them to patch Ubuntu releases.
The hope is a license-compliant third-party will make
patches available in the future.

### 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:   [b0ef26c](https://github.com/mongodb/mongo/commit/b0ef26c639112b50648a02d969298650fbd402a4) * Upstream:   [51caad0](https://github.com/mongodb/mongo/commit/51caad0e005e1a6dc1bd529cb809ba0d7d5eef0d) * Upstream:   [6409523](https://github.com/mongodb/mongo/commit/64095239f41e9f3841d8be9088347db56d35c891) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7929)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-7929)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-7929)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-7929)

### Other references

* <https://jira.mongodb.org/browse/SERVER-51083>
* <https://www.cve.org/CVERecord?id=CVE-2020-7929>