HighFix available
libvncserver, ssvnc and 2 more products — security advisory
LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
- Products
- libvncserver, ssvnc, tightvnc, veyon
- Affected versions
- Not specified
- Fixed versions
- 0.9.11+dfsg-1.2, 1.0.29-5, 1:1.3.9-9.1, 4.1.4+repack1-1
- CVEs
- CVE-2018-20022
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:12 UTC · Revision 1
Source evidence
LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
osv:DEBIAN-CVE-2018-20022
libvncserver
Fixed versions: 0.9.11+dfsg-1.2
libvncserver
Fixed versions: 0.9.11+dfsg-1.2
libvncserver
Fixed versions: 0.9.11+dfsg-1.2
ssvnc
Fixed versions: 1.0.29-5
ssvnc
Fixed versions: 1.0.29-5
ssvnc
Fixed versions: 1.0.29-5
tightvnc
Fixed versions: 1:1.3.9-9.1
tightvnc
Fixed versions: 1:1.3.9-9.1
tightvnc
Fixed versions: 1:1.3.9-9.1
veyon
Fixed versions: 4.1.4+repack1-1
veyon
Fixed versions: 4.1.4+repack1-1
Complete source record
{
"id": "55a287de1a45b7910e5e21c71353ff5b0f8fd691f4ef726a4306dd0ecbaa5668",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2018-20022",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2018-20022",
"summary": "LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR",
"evidence": "osv:DEBIAN-CVE-2018-20022",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
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"evidence": "/affected/0/ranges"
}
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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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"evidence": "/affected/6/ranges"
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"affected_versions": []
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{
"name": {
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},
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{
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/8/package/name"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/9/package/name"
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"prerequisites": [],
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{
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"evidence": "/affected/9/ranges"
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"affected_versions": []
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{
"name": {
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{
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],
"affected_versions": []
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],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2018-20022",
"aliases": [
"DEBIAN-CVE-2018-20022"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.11+dfsg-1.2"
}
]
}
],
"package": {
"name": "libvncserver",
"purl": "pkg:deb/debian/libvncserver?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
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}
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{
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],
"package": {
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"ecosystem": "Debian:13"
},
"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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}
],
"package": {
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"purl": "pkg:deb/debian/libvncserver?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.0.29-5"
}
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}
],
"package": {
"name": "ssvnc",
"purl": "pkg:deb/debian/ssvnc?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
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}
},
{
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],
"package": {
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},
"ecosystem_specific": {
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}
},
{
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}
},
{
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],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/debian/tightvnc?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/debian/tightvnc?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
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],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/debian/tightvnc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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{
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],
"package": {
"name": "veyon",
"purl": "pkg:deb/debian/veyon?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "4.1.4+repack1-1"
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}
],
"package": {
"name": "veyon",
"purl": "pkg:deb/debian/veyon?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-20022.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:03:05.155638219Z",
"provider": "osv",
"upstream": [
"CVE-2018-20022"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2018-20022"
]
},
"related_cves": [
{
"value": "CVE-2018-20022",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 420357,
"published_at": "2018-12-19T16:29:00.467+00:00"
}