---
title: "CVE-2020-26421\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-2020-26421?format=md
keywords: index, follow
---

# CVE-2020-26421

Publication date 11 December 2020

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**4.2 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2020-26421?format=md#impact-score)

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## Description

Crash in USB HID protocol dissector and possibly other dissectors in
Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet
injection or crafted capture file.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| wireshark | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Vulnerable |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Vulnerable |

---

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

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

4.2 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.2 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26421)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-26421)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-26421)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-26421)

### Other references

* <https://gitlab.com/wireshark/wireshark/-/issues/16958>
* <https://www.wireshark.org/security/wnpa-sec-2020-17.html>
* <https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26421.json>
* <https://gitlab.com/wireshark/wireshark/-/commit/61f17d3c2112f5a9da40a33417b778bf66a10aee>
* <https://www.cve.org/CVERecord?id=CVE-2020-26421>