---
title: "CVE-2020-8927\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-2020-8927?format=md
keywords: index, follow
---

# CVE-2020-8927

Publication date 15 September 2020

Last updated 25 August 2025

---

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-2020-8927?format=md#impact-score)

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## Description

A buffer overflow exists in the Brotli library versions prior to 1.0.8
where an attacker controlling the input length of a "one-shot"
decompression request to a script can trigger a crash, which happens when
copying over chunks of data larger than 2 GiB. It is recommended to update
your Brotli library to 1.0.8 or later. If one cannot update, we recommend
to use the "streaming" API as opposed to the "one-shot" API, and impose
chunk size limits.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| brotli | 20.04 LTS focal | Fixed 1.0.7-6ubuntu0.1 |
| 18.04 LTS bionic | Fixed 1.0.3-1ubuntu1.3 |
| 16.04 LTS xenial | Fixed 1.0.3-1ubuntu1~16.04.2 |
| 14.04 LTS trusty | Not in release |

---

* [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-2020-8927?format=md#patch-details)

### 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 |
| --- | --- |
| brotli | * Upstream:   [223d80c](https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6) |

## 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 | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | Low |
  | Availability impact | Low |
* Scores

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

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8927)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-8927)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-8927)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-8927)

### Related Ubuntu Security Notices (USN)

+ [USN-4568-1](https://usn.ubuntu.com/USN-4568-1)
+ Brotli vulnerability
+ 5 October 2020

### Other references

* <https://github.com/google/brotli/releases/tag/v1.0.9>
* <https://www.cve.org/CVERecord?id=CVE-2020-8927>