CVE-2020-26421

Name: CVE-2020-26421
Creator: NVD / NIST
Published: 2020-12-11T19:15:12.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.59%

Last modified Jun 17, 2026

CVE-2020-26421 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 2.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

2.59%

83.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Wireshark	Wireshark	>= 3.2.0, <= 3.2.8
Wireshark	Wireshark	3.4.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Debian	Debian Linux	9.0
Oracle	Zfs Storage Appliance Kit	8.8

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26421.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/16958Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M75HYXU36SP6GHIDPHNZGJKEO6TX4C4Y/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YHWDZPWQJMLK64VFDWJC5SEGPNH6Y72Z/
https://security.gentoo.org/glsa/202101-12Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2020-17.htmlVendor Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26421.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/16958Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M75HYXU36SP6GHIDPHNZGJKEO6TX4C4Y/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YHWDZPWQJMLK64VFDWJC5SEGPNH6Y72Z/
https://security.gentoo.org/glsa/202101-12Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2020-17.htmlVendor Advisory

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is 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 injection or crafted capture file.

How severe is CVE-2020-26421?

CVE-2020-26421 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.59% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26421?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26421?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST