High
Security advisory
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
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-39920
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:57 UTC · Revision 1
Source evidence
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
osv:CVE-2021-39920
Complete source record
{
"id": "5b226f172d6dc6315c43bec64cab04dd96d1bfddac0dbfdde61ae57655e9f4dc",
"url": "https://osv.dev/vulnerability/CVE-2021-39920",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-39920",
"summary": "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",
"evidence": "osv:CVE-2021-39920",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-39920",
"aliases": [
"CVE-2021-39920"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wireshark/wireshark",
"type": "GIT",
"events": [
{
"introduced": "9733f173ea5e6255e8da208ef183210aa264d948"
},
{
"fixed": "733b3a137c2ba8c8e517e5fb37bcc3030a43d603"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.4.0"
},
{
"fixed": "3.4.10"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v3.4.10rc0",
"wireshark-3.4.9",
"v3.4.9",
"v3.4.9rc0",
"wireshark-3.4.8",
"v3.4.8",
"v3.4.8rc0",
"wireshark-3.4.7",
"v3.4.7",
"v3.4.7rc0",
"wireshark-3.4.6",
"v3.4.6",
"v3.4.6rc0",
"wireshark-3.4.5",
"v3.4.5",
"v3.4.5rc0",
"wireshark-3.4.4",
"v3.4.4",
"v3.4.4rc0",
"wireshark-3.4.3",
"v3.4.3",
"v3.4.3rc0",
"wireshark-3.4.2",
"v3.4.2",
"v3.4.2rc0",
"wireshark-3.4.1",
"v3.4.1",
"v3.4.1rc0",
"wireshark-3.4.0",
"v3.4.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39920.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.com/wireshark/wireshark",
"type": "GIT",
"events": [
{
"introduced": "9733f173ea5e6255e8da208ef183210aa264d948"
},
{
"fixed": "733b3a137c2ba8c8e517e5fb37bcc3030a43d603"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.4.0"
},
{
"fixed": "3.4.10"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v3.4.10rc0",
"wireshark-3.4.9",
"v3.4.9",
"v3.4.9rc0",
"wireshark-3.4.8",
"v3.4.8",
"v3.4.8rc0",
"wireshark-3.4.7",
"v3.4.7",
"v3.4.7rc0",
"wireshark-3.4.6",
"v3.4.6",
"v3.4.6rc0",
"wireshark-3.4.5",
"v3.4.5",
"v3.4.5rc0",
"wireshark-3.4.4",
"v3.4.4",
"v3.4.4rc0",
"wireshark-3.4.3",
"v3.4.3",
"v3.4.3rc0",
"wireshark-3.4.2",
"v3.4.2",
"v3.4.2rc0",
"wireshark-3.4.1",
"v3.4.1",
"v3.4.1rc0",
"wireshark-3.4.0",
"v3.4.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39920.json"
}
}
],
"modified": "2026-10-24T10:51:25.312786573Z",
"provider": "osv",
"references": [
"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://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39920.json",
"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/wireshark/wireshark/-/issues/17705"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "34"
},
{
"last_affected": "34"
},
{
"introduced": "35"
},
{
"last_affected": "35"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-39920",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442604,
"published_at": "2021-11-18T19:15:08.333+00:00"
}