High
libvncserver, veyon and 1 more products — security advisory
An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
- Products
- libvncserver, veyon, x11vnc
- Affected versions
- 0.9.10+dfsg-3, 0.9.10+dfsg-3build1, 0.9.10+dfsg-3ubuntu0.16.04.1, 0.9.10+dfsg-3ubuntu0.16.04.2, 0.9.10+dfsg-3ubuntu0.16.04.3, 0.9.10+dfsg-3ubuntu0.16.04.4, 0.9.10+dfsg-3ubuntu0.16.04.5, 0.9.10+dfsg-3ubuntu0.16.04.6, 0.9.11+dfsg-1, 0.9.11+dfsg-1.3, 0.9.11+dfsg-1ubuntu1, 0.9.11+dfsg-1ubuntu1.1, 0.9.11+dfsg-1ubuntu1.2, 0.9.11+dfsg-1ubuntu1.3, 0.9.11+dfsg-1ubuntu1.4, 0.9.12+dfsg-3ubuntu3, 0.9.12+dfsg-6, 0.9.12+dfsg-7, 0.9.12+dfsg-8, 0.9.12+dfsg-9, 0.9.12+dfsg-9ubuntu0.1, 0.9.12+dfsg-9ubuntu0.2, 0.9.12+dfsg-9ubuntu0.3, 0.9.13-1.1, 0.9.13-1.2build1, 0.9.13-1.2ubuntu0.1~esm1, 0.9.13-2, 0.9.13-2build1, 0.9.13-3, 0.9.13-3ubuntu0.1~esm1, 0.9.13-6, 0.9.16-3, 0.9.16-3ubuntu0.1~esm1, 4.2.4+repack1-2, 4.2.5+repack1-1, 4.3.1+repack1-1, 4.3.1+repack1-2, 4.3.1+repack1-2build1, 4.3.1+repack1-2build2, 4.5.3+repack1-1build1, 4.5.3+repack1-1build2, 4.7.5+repack1-1build2, 4.7.5+repack1-1ubuntu1, 4.7.5+repack1-1ubuntu3, 4.7.5+repack1-1ubuntu4, 4.7.5+repack1-1ubuntu5, 4.7.5+repack1-1ubuntu6, 4.7.5+repack1-1ubuntu7, 4.9.7+repack1-1, 4.9.7+repack1-1.1, 4.9.7+repack1-1.1build1, 4.9.7+repack1-1.1build2, 4.9.7+repack1-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2018-21247
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:29 UTC · Revision 1
Source evidence
An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
osv:UBUNTU-CVE-2018-21247
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
veyon
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
veyon
Fixed versions: Not specified
veyon
Fixed versions: Not specified
veyon
Fixed versions: Not specified
veyon
Fixed versions: Not specified
Complete source record
{
"id": "73f514276d59ea95f35e2e7ad7d7b94806e6d9d43b712c1076c5973e16e1b348",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-21247",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2018-21247",
"summary": "An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.",
"evidence": "osv:UBUNTU-CVE-2018-21247",
"products": [
{
"name": {
"value": "x11vnc",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-1.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.10+dfsg-3",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3build1",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.1",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.2",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.3",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.4",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.5",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.6",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-1.2build1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.13-1.2ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.11+dfsg-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.2",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.3",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.4",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-2",
"evidence": "/affected/4/versions"
},
{
"value": "0.9.13-2build1",
"evidence": "/affected/4/versions"
},
{
"value": "0.9.13-3",
"evidence": "/affected/4/versions"
},
{
"value": "0.9.13-3ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.11+dfsg-1.3",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-3ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-6",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-7",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-8",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-9",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.1",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.2",
"evidence": "/affected/5/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.4+repack1-2",
"evidence": "/affected/6/versions"
},
{
"value": "4.2.5+repack1-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.3.1+repack1-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.3.1+repack1-2",
"evidence": "/affected/6/versions"
},
{
"value": "4.3.1+repack1-2build1",
"evidence": "/affected/6/versions"
},
{
"value": "4.3.1+repack1-2build2",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-6",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.16-3",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.16-3ubuntu0.1~esm1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.5.3+repack1-1build1",
"evidence": "/affected/8/versions"
},
{
"value": "4.5.3+repack1-1build2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.5+repack1-1build2",
"evidence": "/affected/9/versions"
},
{
"value": "4.7.5+repack1-1ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "4.7.5+repack1-1ubuntu3",
"evidence": "/affected/9/versions"
},
{
"value": "4.7.5+repack1-1ubuntu4",
"evidence": "/affected/9/versions"
},
{
"value": "4.7.5+repack1-1ubuntu5",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.5+repack1-1ubuntu6",
"evidence": "/affected/10/versions"
},
{
"value": "4.7.5+repack1-1ubuntu7",
"evidence": "/affected/10/versions"
},
{
"value": "4.9.7+repack1-1",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.9.7+repack1-1build1",
"evidence": "/affected/11/versions"
},
{
"value": "4.9.7+repack1-1.1",
"evidence": "/affected/11/versions"
},
{
"value": "4.9.7+repack1-1.1build1",
"evidence": "/affected/11/versions"
},
{
"value": "4.9.7+repack1-1.1build2",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.9.7+repack1-1",
"evidence": "/affected/12/versions"
},
{
"value": "4.9.7+repack1-1build1",
"evidence": "/affected/12/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2018-21247",
"aliases": [
"UBUNTU-CVE-2018-21247"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "low"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"0.9.13-1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.13-1.1"
},
{
"binary_name": "x11vnc-data",
"binary_version": "0.9.13-1.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.9.10+dfsg-3",
"0.9.10+dfsg-3build1",
"0.9.10+dfsg-3ubuntu0.16.04.1",
"0.9.10+dfsg-3ubuntu0.16.04.2",
"0.9.10+dfsg-3ubuntu0.16.04.3",
"0.9.10+dfsg-3ubuntu0.16.04.4",
"0.9.10+dfsg-3ubuntu0.16.04.5",
"0.9.10+dfsg-3ubuntu0.16.04.6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
},
{
"binary_name": "libvncserver-config",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"0.9.13-1.2build1",
"0.9.13-1.2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.13-1.2ubuntu0.1~esm1"
},
{
"binary_name": "x11vnc-data",
"binary_version": "0.9.13-1.2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.9.11+dfsg-1",
"0.9.11+dfsg-1ubuntu1",
"0.9.11+dfsg-1ubuntu1.1",
"0.9.11+dfsg-1ubuntu1.2",
"0.9.11+dfsg-1ubuntu1.3",
"0.9.11+dfsg-1ubuntu1.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.11+dfsg-1ubuntu1.4"
},
{
"binary_name": "libvncserver-config",
"binary_version": "0.9.11+dfsg-1ubuntu1.4"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.11+dfsg-1ubuntu1.4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"0.9.13-2",
"0.9.13-2build1",
"0.9.13-3",
"0.9.13-3ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.13-3ubuntu0.1~esm1"
},
{
"binary_name": "x11vnc-data",
"binary_version": "0.9.13-3ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.9.11+dfsg-1.3",
"0.9.12+dfsg-3ubuntu3",
"0.9.12+dfsg-6",
"0.9.12+dfsg-7",
"0.9.12+dfsg-8",
"0.9.12+dfsg-9",
"0.9.12+dfsg-9ubuntu0.1",
"0.9.12+dfsg-9ubuntu0.2",
"0.9.12+dfsg-9ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.12+dfsg-9ubuntu0.3"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.12+dfsg-9ubuntu0.3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "veyon",
"purl": "pkg:deb/ubuntu/veyon?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"4.2.4+repack1-2",
"4.2.5+repack1-1",
"4.3.1+repack1-1",
"4.3.1+repack1-2",
"4.3.1+repack1-2build1",
"4.3.1+repack1-2build2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
"binary_version": "4.3.1+repack1-2build2"
},
{
"binary_name": "veyon-configurator",
"binary_version": "4.3.1+repack1-2build2"
},
{
"binary_name": "veyon-master",
"binary_version": "4.3.1+repack1-2build2"
},
{
"binary_name": "veyon-plugins",
"binary_version": "4.3.1+repack1-2build2"
},
{
"binary_name": "veyon-service",
"binary_version": "4.3.1+repack1-2build2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.9.13-6",
"0.9.16-3",
"0.9.16-3ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.16-3ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "veyon",
"purl": "pkg:deb/ubuntu/veyon?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.5.3+repack1-1build1",
"4.5.3+repack1-1build2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
"binary_version": "4.5.3+repack1-1build2"
},
{
"binary_name": "veyon-configurator",
"binary_version": "4.5.3+repack1-1build2"
},
{
"binary_name": "veyon-master",
"binary_version": "4.5.3+repack1-1build2"
},
{
"binary_name": "veyon-plugins",
"binary_version": "4.5.3+repack1-1build2"
},
{
"binary_name": "veyon-service",
"binary_version": "4.5.3+repack1-1build2"
}
]
}
},
{
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],
"modified": "2026-10-17T12:55:26.615661835Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2018-21247",
"https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13",
"https://www.cve.org/CVERecord?id=CVE-2018-21247"
]
},
"related_cves": [
{
"value": "CVE-2018-21247",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 353764,
"published_at": "2020-06-17T16:15:00+00:00"
}