High
Security advisory
A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-35498
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:54 UTC · Revision 1
Source evidence
A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
osv:CVE-2020-35498
Complete source record
{
"id": "18a4fc16a61febfe9fe20daef5274d0c78a3265db41f3d7651eb07e972399dda",
"url": "https://osv.dev/vulnerability/CVE-2020-35498",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-35498",
"summary": "A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.",
"evidence": "osv:CVE-2020-35498",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-35498",
"aliases": [
"CVE-2020-35498"
],
"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/openvswitch/ovs",
"type": "GIT",
"events": [
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{
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{
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{
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{
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{
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{
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{
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{
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}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.5.0"
},
{
"fixed": "2.5.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.6.0"
},
{
"fixed": "2.6.10"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.7.0"
},
{
"fixed": "2.7.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
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},
{
"fixed": "2.8.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.9.0"
},
{
"fixed": "2.9.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.10.0"
},
{
"fixed": "2.10.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.11.0"
},
{
"fixed": "2.11.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.12.0"
},
{
"fixed": "2.12.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.13.0"
},
{
"fixed": "2.13.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.14.0"
},
{
"fixed": "2.14.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v2.14.1",
"v2.12.2",
"v2.10.6",
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"v2.11.4",
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"v2.9.7",
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"v2.6.8",
"v2.5.10",
"v2.13.0",
"v2.11.3",
"v2.10.4",
"v2.8.8",
"v2.7.10",
"v2.5.9",
"v2.6.7",
"v2.12.0",
"v2.11.2",
"v2.10.3",
"v2.9.6",
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"v2.11.1",
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"v2.7.3",
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"v2.7.2",
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"v2.5.3",
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"v2.5.2",
"v2.6.1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35498.json"
}
}
],
"modified": "2026-10-24T10:31:00.208118427Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/",
"https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html",
"https://security.gentoo.org/glsa/202311-16",
"https://www.debian.org/security/2021/dsa-4852",
"https://bugzilla.redhat.com/show_bug.cgi?id=1908845",
"https://www.openwall.com/lists/oss-security/2021/02/10/4"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
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},
{
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{
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},
{
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],
"source": "CPE_STRING"
}
]
},
{
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],
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}
]
}
},
"related_cves": [
{
"value": "CVE-2020-35498",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 439487,
"published_at": "2021-02-11T18:15:15.677+00:00"
}