CriticalFix available
italc, libvncserver and 1 more products — security advisory
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
- Products
- italc, libvncserver, tightvnc
- 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, 0.9.11+dfsg-1, 0.9.11+dfsg-1ubuntu1, 0.9.9+dfsg-1, 0.9.9+dfsg-1ubuntu1, 0.9.9+dfsg-1ubuntu1.1, 0.9.9+dfsg-1ubuntu1.2, 0.9.9+dfsg-1ubuntu1.3, 1.3.10-0ubuntu2, 1.3.10-0ubuntu3, 1.3.10-0ubuntu4, 1.3.10-0ubuntu5, 1.3.9-6.4, 1.3.9-6.4ubuntu1, 1:1.3.10-10, 1:1.3.10-10build1, 1:1.3.10-11, 1:1.3.10-3, 1:1.3.10-5, 1:1.3.10-7, 1:1.3.10-7build1, 1:1.3.10-7build2, 1:1.3.10-8, 1:1.3.10-9, 1:2.0.2+dfsg1-3, 1:2.0.2+dfsg1-4, 1:3.0.3+dfsg1-1, 1:3.0.3+dfsg1-2, 1:3.0.3+dfsg1-2build1, 1:3.0.3+dfsg1-2ubuntu1, 1:3.0.3+dfsg1-3
- Fixed versions
- 0.9.10+dfsg-3ubuntu0.16.04.3, 0.9.11+dfsg-1ubuntu1.1, 0.9.9+dfsg-1ubuntu1.4, 1.3.9-6.5+deb8u1build0.14.04.1~esm1, 1:2.0.2+dfsg1-4ubuntu0.1, 1:3.0.3+dfsg1-3ubuntu0.1
- CVEs
- CVE-2018-20748
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:29 UTC · Revision 1
Source evidence
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
osv:UBUNTU-CVE-2018-20748
libvncserver
Fixed versions: 0.9.9+dfsg-1ubuntu1.4
tightvnc
Fixed versions: 1.3.9-6.5+deb8u1build0.14.04.1~esm1
italc
Fixed versions: 1:2.0.2+dfsg1-4ubuntu0.1
libvncserver
Fixed versions: 0.9.10+dfsg-3ubuntu0.16.04.3
tightvnc
Fixed versions: Not specified
italc
Fixed versions: 1:3.0.3+dfsg1-3ubuntu0.1
libvncserver
Fixed versions: 0.9.11+dfsg-1ubuntu1.1
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
Complete source record
{
"id": "bcde17a86a4f43e70f3be4d02b14961bcc92758ae6486fc634d29aa9fca06681",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-20748",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2018-20748",
"summary": "LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.",
"evidence": "osv:UBUNTU-CVE-2018-20748",
"products": [
{
"name": {
"value": "libvncserver",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.9+dfsg-1ubuntu1.4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "0.9.9+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.9+dfsg-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.9+dfsg-1ubuntu1.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.9+dfsg-1ubuntu1.2",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.9+dfsg-1ubuntu1.3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.3.9-6.5+deb8u1build0.14.04.1~esm1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.3.9-6.4",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.9-6.4ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "italc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.2+dfsg1-4ubuntu0.1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:2.0.2+dfsg1-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:2.0.2+dfsg1-4",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.3",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "0.9.10+dfsg-3",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.10+dfsg-3build1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "italc",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:3.0.3+dfsg1-3ubuntu0.1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "1:3.0.3+dfsg1-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:3.0.3+dfsg1-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:3.0.3+dfsg1-2build1",
"evidence": "/affected/5/versions"
},
{
"value": "1:3.0.3+dfsg1-2ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1:3.0.3+dfsg1-3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.11+dfsg-1ubuntu1.1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "0.9.11+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/7/versions"
},
{
"value": "1.3.10-0ubuntu4",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu5",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-3",
"evidence": "/affected/9/versions"
},
{
"value": "1:1.3.10-5",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-7",
"evidence": "/affected/10/versions"
},
{
"value": "1:1.3.10-7build1",
"evidence": "/affected/10/versions"
},
{
"value": "1:1.3.10-7build2",
"evidence": "/affected/10/versions"
},
{
"value": "1:1.3.10-8",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-9",
"evidence": "/affected/11/versions"
},
{
"value": "1:1.3.10-10",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-10build1",
"evidence": "/affected/12/versions"
},
{
"value": "1:1.3.10-11",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-10",
"evidence": "/affected/13/versions"
},
{
"value": "1:1.3.10-10build1",
"evidence": "/affected/13/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2018-20748",
"aliases": [
"UBUNTU-CVE-2018-20748"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.9+dfsg-1ubuntu1.4"
}
]
}
],
"package": {
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"0.9.9+dfsg-1",
"0.9.9+dfsg-1ubuntu1",
"0.9.9+dfsg-1ubuntu1.1",
"0.9.9+dfsg-1ubuntu1.2",
"0.9.9+dfsg-1ubuntu1.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncserver-config",
"binary_version": "0.9.9+dfsg-1ubuntu1.4"
},
{
"binary_name": "libvncserver0",
"binary_version": "0.9.9+dfsg-1ubuntu1.4"
},
{
"binary_name": "linuxvnc",
"binary_version": "0.9.9+dfsg-1ubuntu1.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=trusty%2Fesm",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.3.9-6.4",
"1.3.9-6.4ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.2+dfsg1-4ubuntu0.1"
}
]
}
],
"package": {
"name": "italc",
"purl": "pkg:deb/ubuntu/italc?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1:2.0.2+dfsg1-3",
"1:2.0.2+dfsg1-4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "italc-client",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
},
{
"binary_name": "italc-management-console",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
},
{
"binary_name": "italc-master",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
},
{
"binary_name": "libitalccore",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.10+dfsg-3ubuntu0.16.04.3"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
},
{
"binary_name": "libvncserver-config",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.3.10-0ubuntu2",
"1.3.10-0ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu3"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.10-0ubuntu3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:3.0.3+dfsg1-3ubuntu0.1"
}
]
}
],
"package": {
"name": "italc",
"purl": "pkg:deb/ubuntu/italc?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1:3.0.3+dfsg1-1",
"1:3.0.3+dfsg1-2",
"1:3.0.3+dfsg1-2build1",
"1:3.0.3+dfsg1-2ubuntu1",
"1:3.0.3+dfsg1-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "italc-client",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
},
{
"binary_name": "italc-management-console",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
},
{
"binary_name": "italc-master",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
},
{
"binary_name": "libitalccore",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.11+dfsg-1ubuntu1.1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.11+dfsg-1ubuntu1.1"
},
{
"binary_name": "libvncserver-config",
"binary_version": "0.9.11+dfsg-1ubuntu1.1"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.11+dfsg-1ubuntu1.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.3.10-0ubuntu3",
"1.3.10-0ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu4"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.10-0ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.3.10-0ubuntu5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu5"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.10-0ubuntu5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:1.3.10-3",
"1:1.3.10-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20748.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncpasswd",
"binary_version": "1:1.3.10-5"
},
{
"binary_name": "tightvncserver",
"binary_version": "1:1.3.10-5"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1:1.3.10-5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1:1.3.10-7",
"1:1.3.10-7build1",
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}
],
"modified": "2026-10-17T12:55:25.963500563Z",
"provider": "osv",
"upstream": [
"CVE-2018-20748"
],
"references": [
"https://ubuntu.com/security/CVE-2018-20748",
"https://ubuntu.com/security/notices/USN-3877-1",
"https://ubuntu.com/security/notices/USN-4547-1",
"https://ubuntu.com/security/notices/USN-4587-1",
"https://www.cve.org/CVERecord?id=CVE-2018-20748"
]
},
"related_cves": [
{
"value": "CVE-2018-20748",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 353750,
"published_at": "2019-01-30T00:00:00+00:00"
}