Medium
openvpn3-client — security advisory
The configuration initialization tool in OpenVPN 3 Linux v20 through v24 on Linux allows a local attacker to use symlinks pointing at an arbitrary directory which will change the ownership and permissions of that destination directory.
- Products
- openvpn3-client
- Affected versions
- 24+dfsg-1, 24+dfsg-2build1, 24.1+dfsg-1, 25+dfsg-2ubuntu1, 25+dfsg-3, 25+dfsg-4, 26+dfsg-1, 26+dfsg-2, 27+dfsg-1, 27.1+dfsg-1, 27.1+dfsg-2ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-3908
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:48 UTC · Revision 1
Source evidence
The configuration initialization tool in OpenVPN 3 Linux v20 through v24 on Linux allows a local attacker to use symlinks pointing at an arbitrary directory which will change the ownership and permissions of that destination directory.
osv:UBUNTU-CVE-2025-3908
openvpn3-client
Fixed versions: Not specified
openvpn3-client
Fixed versions: Not specified
openvpn3-client
Fixed versions: Not specified
Complete source record
{
"id": "2a802c67bd7fed54e448d2a07c4c9daa574f16cb8891e1ee520afd88f23059a2",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-3908",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-3908",
"summary": "The configuration initialization tool in OpenVPN 3 Linux v20 through v24 on Linux allows a local attacker to use symlinks pointing at an arbitrary directory which will change the ownership and permissions of that destination directory.",
"evidence": "osv:UBUNTU-CVE-2025-3908",
"products": [
{
"name": {
"value": "openvpn3-client",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "24+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "24+dfsg-2build1",
"evidence": "/affected/0/versions"
},
{
"value": "24.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "25+dfsg-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "25+dfsg-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "openvpn3-client",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "27+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "27.1+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "27.1+dfsg-2ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "openvpn3-client",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "25+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "25+dfsg-4",
"evidence": "/affected/2/versions"
},
{
"value": "26+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "26+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "27+dfsg-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2025-3908",
"aliases": [
"UBUNTU-CVE-2025-3908"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "openvpn3-client",
"purl": "pkg:deb/ubuntu/openvpn3-client?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"24+dfsg-1",
"24+dfsg-2build1",
"24.1+dfsg-1",
"25+dfsg-2ubuntu1",
"25+dfsg-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-3908.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openvpn3-client",
"binary_version": "25+dfsg-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "openvpn3-client",
"purl": "pkg:deb/ubuntu/openvpn3-client?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"27+dfsg-1",
"27.1+dfsg-1",
"27.1+dfsg-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-3908.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openvpn3-client",
"binary_version": "27.1+dfsg-2ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "openvpn3-client",
"purl": "pkg:deb/ubuntu/openvpn3-client?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"25+dfsg-3",
"25+dfsg-4",
"26+dfsg-1",
"26+dfsg-2",
"27+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-3908.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openvpn3-client",
"binary_version": "27+dfsg-1"
}
]
}
}
],
"modified": "2026-10-17T12:57:27.297859175Z",
"provider": "osv",
"upstream": [
"CVE-2025-3908"
],
"references": [
"https://ubuntu.com/security/CVE-2025-3908",
"https://www.cve.org/CVERecord?id=CVE-2025-3908",
"https://community.openvpn.net/Security%20Announcements/CVE-2025-3908"
]
},
"related_cves": [
{
"value": "CVE-2025-3908",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 357520,
"published_at": "2025-05-19T15:15:00+00:00"
}