What’s Vulnerable › Vulnerabilities

CVE-2021-39920

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-18 · updated 2026-06-17
• Weakness: CWE-476

Description

NULL pointer exception in the IPPUSB dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file

Affected products

• Fedoraproject Fedora: 34, 35
• Wireshark Foundation Wireshark: from 3.4.0 before 3.4.10 — fixed in 3.4.10

How to fix

Upgrade to a fixed version: Wireshark Foundation Wireshark 3.4.10. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39920.json
• https://gitlab.com/wireshark/wireshark/-/issues/17705
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH/
• https://security.gentoo.org/glsa/202210-04
• https://www.debian.org/security/2021/dsa-5019
• https://www.wireshark.org/security/wnpa-sec-2021-15.html
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39920.json
• https://gitlab.com/wireshark/wireshark/-/issues/17705
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH/
• https://security.gentoo.org/glsa/202210-04

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