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Vulnerability record · CVE-2021-39926 · published 19 November 2021

CVE-2021-39926: Wireshark classic buffer overflow vulnerability

Wireshark · Wireshark

Buffer overflow in the Bluetooth HCI_ISO dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file

7.5 CVSS 3.1 High EPSS 7.8% · top 5.5% CWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score, v2 5.0
7.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Buffer overflow in the Bluetooth HCI_ISO dissector in Wireshark 3.4.0 to 3.4.9 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-2021-39926.json Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17649 ExploitIssue TrackingPatchThird 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-2021-08.html Vendor Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39926.json Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17649 ExploitIssue TrackingPatchThird 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-2021-08.html Vendor Advisory

Track CVE-2021-39926 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-39926), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.