LowFix available
openvpn — security advisory
An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.
- Products
- openvpn
- Affected versions
- Not specified
- Fixed versions
- 2.4.9-r0
- CVEs
- CVE-2020-11810
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:01 UTC · Revision 1
Source evidence
An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.
osv:ALPINE-CVE-2020-11810
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
openvpn
Fixed versions: 2.4.9-r0
Complete source record
{
"id": "504724ebe71f7415e3d55073038dd6684cf7130d0f2518cc326687512d78b785",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-11810",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-11810",
"summary": "An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.",
"evidence": "osv:ALPINE-CVE-2020-11810",
"products": [
{
"name": {
"value": "openvpn",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openvpn",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.9-r0",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
}
],
"severity": "low",
"structured": {
"id": "ALPINE-CVE-2020-11810",
"aliases": [
"ALPINE-CVE-2020-11810"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.10"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.11"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.12"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.9-r0"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:apk/alpine/openvpn?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-11810.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T11:17:55.101219665Z",
"provider": "osv",
"upstream": [
"CVE-2020-11810"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-11810"
]
},
"related_cves": [
{
"value": "CVE-2020-11810",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450357,
"published_at": "2020-04-27T15:15:12.407+00:00"
}