Critical
Security advisory
The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-6836
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:25 UTC · Revision 1
Source evidence
The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.
osv:CVE-2018-6836
Complete source record
{
"id": "1c1b6a68e15319797ee03590f6921651fa1db4255dda4f67c0065e80e68498bf",
"url": "https://osv.dev/vulnerability/CVE-2018-6836",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-6836",
"summary": "The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.",
"evidence": "osv:CVE-2018-6836",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2018-6836",
"aliases": [
"CVE-2018-6836"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wireshark/wireshark",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "90a7be11a4fdc292f2af40cd49ad7e1bce335dfc"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "2.4.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"wireshark-2.4.4",
"v2.4.4",
"v2.4.4rc0",
"wireshark-2.4.3",
"v2.4.3",
"v2.4.3rc0",
"wireshark-2.4.2",
"v2.4.2",
"v2.4.2rc0",
"wireshark-2.4.1",
"v2.4.1",
"v2.4.1rc0",
"wireshark-2.4.0",
"v2.4.0",
"v2.4.0rc2",
"v2.4.0rc1",
"v2.4.0rc0",
"v2.3.0rc0",
"v2.1.2rc0",
"wireshark-2.1.1",
"v2.1.1",
"v2.1.1rc0",
"wireshark-2.1.0",
"v2.1.0",
"v2.1.0rc0",
"v1.99.10rc0",
"wireshark-1.99.9",
"v1.99.9",
"v1.99.9rc0",
"wireshark-1.99.8",
"v1.99.8",
"v1.99.8rc0",
"wireshark-1.99.7",
"v1.99.7",
"v1.99.7rc0",
"wireshark-1.99.6",
"v1.99.6",
"v1.99.6rc0",
"wireshark-1.99.5",
"v1.99.5",
"v1.99.5rc0",
"wireshark-1.99.4",
"v1.99.4",
"v1.99.4rc0",
"wireshark-1.99.3",
"v1.99.3",
"v1.99.3rc0",
"wireshark-1.99.2",
"v1.99.2",
"v1.99.2rc0",
"wireshark-1.99.1",
"v1.99.1",
"v1.99.1rc0",
"wireshark-1.99.0",
"v1.99.0",
"v1.99.0-rc1",
"v1.11.4-rc1",
"wireshark-1.11.3",
"v1.11.3",
"v1.11.3-rc1",
"v1.11.2",
"v1.11.2-rc1",
"v1.11.1",
"v1.11.1-rc1",
"v1.11.0",
"v1.11.0-rc1",
"start",
"ethereal-0.3.15",
"ethereal-0-3-15",
"backups/ethereal@18706"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6836.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.com/wireshark/wireshark",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "90a7be11a4fdc292f2af40cd49ad7e1bce335dfc"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "2.4.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"wireshark-2.4.4",
"v2.4.4",
"v2.4.4rc0",
"wireshark-2.4.3",
"v2.4.3",
"v2.4.3rc0",
"wireshark-2.4.2",
"v2.4.2",
"v2.4.2rc0",
"wireshark-2.4.1",
"v2.4.1",
"v2.4.1rc0",
"wireshark-2.4.0",
"v2.4.0",
"v2.4.0rc2",
"v2.4.0rc1",
"v2.4.0rc0",
"v2.3.0rc0",
"v2.1.2rc0",
"wireshark-2.1.1",
"v2.1.1",
"v2.1.1rc0",
"wireshark-2.1.0",
"v2.1.0",
"v2.1.0rc0",
"v1.99.10rc0",
"wireshark-1.99.9",
"v1.99.9",
"v1.99.9rc0",
"wireshark-1.99.8",
"v1.99.8",
"v1.99.8rc0",
"wireshark-1.99.7",
"v1.99.7",
"v1.99.7rc0",
"wireshark-1.99.6",
"v1.99.6",
"v1.99.6rc0",
"wireshark-1.99.5",
"v1.99.5",
"v1.99.5rc0",
"wireshark-1.99.4",
"v1.99.4",
"v1.99.4rc0",
"wireshark-1.99.3",
"v1.99.3",
"v1.99.3rc0",
"wireshark-1.99.2",
"v1.99.2",
"v1.99.2rc0",
"wireshark-1.99.1",
"v1.99.1",
"v1.99.1rc0",
"wireshark-1.99.0",
"v1.99.0",
"v1.99.0-rc1",
"v1.11.4-rc1",
"wireshark-1.11.3",
"v1.11.3",
"v1.11.3-rc1",
"v1.11.2",
"v1.11.2-rc1",
"v1.11.1",
"v1.11.1-rc1",
"v1.11.0",
"v1.11.0-rc1",
"start",
"ethereal-0.3.15",
"ethereal-0-3-15",
"backups/ethereal@18706"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6836.json"
}
}
],
"modified": "2026-10-24T10:30:53.049964924Z",
"provider": "osv",
"references": [
"https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=28960d79cca262ac6b974f339697b299a1e28fef",
"https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14397",
"https://code.wireshark.org/review/#/c/25660/",
"https://code.wireshark.org/review/#/c/25660/2/wiretap/netmon.c"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-6836",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437824,
"published_at": "2018-02-08T07:29:01.197+00:00"
}