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Vulnerability record · CVE-2021-39928 · published 18 November 2021

CVE-2021-39928: Wireshark null pointer dereference vulnerability

Wireshark · Wireshark

NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file

7.5 CVSS 3.1 High EPSS 5.9% · top 7.0% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
5.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39928.json Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17704 ExploitIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00015.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5K
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJ
https://security.gentoo.org/glsa/202210-04 Third Party Advisory
https://www.debian.org/security/2021/dsa-5019 Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-13.html Vendor Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39928.json Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17704 ExploitIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00015.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5K
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJ
https://security.gentoo.org/glsa/202210-04 Third Party Advisory
https://www.debian.org/security/2021/dsa-5019 Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-13.html Vendor Advisory

Track CVE-2021-39928 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Source: NIST National Vulnerability Database (record CVE-2021-39928), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.