High
Security advisory
An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly "no trust boundary crossed.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-14399
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:33 UTC · Revision 1
Source evidence
An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly "no trust boundary crossed.
osv:CVE-2020-14399
Complete source record
{
"id": "ac410ef1f7417798b71622f8e9d8c65e2531f66cfd42e1b726586973d96e72dc",
"url": "https://osv.dev/vulnerability/CVE-2020-14399",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-14399",
"summary": "An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly \"no trust boundary crossed.",
"evidence": "osv:CVE-2020-14399",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-14399",
"aliases": [
"CVE-2020-14399"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/libvnc/libvncserver",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "2aa20dad4c23c18948d3f63b33f9dfec1f837729"
},
{
"fixed": "23e5cbe6b090d7f22982aee909a6a618174d3c2d"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.9.13"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "23e5cbe6b090d7f22982aee909a6a618174d3c2d"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"LibVNCServer-0.9.12",
"LibVNCServer-0.9.11",
"LibVNCServer-0.9.10",
"LibVNCServer-0.9.9",
"LibVNCServer-0.9.8",
"X11VNC_0_9_12",
"X11VNC_0_9_11",
"X11VNC_0_9_10",
"X11VNC_0_9_9",
"X11VNC_0_9_8",
"X11VNC_0_9_7",
"X11VNC_REL_0_9_6",
"X11VNC_REL_0_9_5",
"X11VNC_REL_0_9_4"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-14399.json",
"vanir_signatures": [
{
"id": "CVE-2020-14399-2ff28e15",
"digest": {
"length": 6767,
"function_hash": "292719199051264423232023195326445512722"
},
"source": "https://github.com/libvnc/libvncserver/commit/23e5cbe6b090d7f22982aee909a6a618174d3c2d",
"target": {
"file": "libvncclient/rfbproto.c",
"function": "SetFormatAndEncodings"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-14399-4d282684",
"digest": {
"threshold": 0.9,
"line_hashes": [
"289411994645727400457192257966915221379",
"208837877831103949359398245394014295558",
"332985853190493794914941061839301886752",
"88759214378154492617504044073384416189",
"101271520213990510100092381220390867601",
"55113811666554751528682358494177991134",
"181492142388692610613554751535531639094",
"218617286323755537607650297728216934745",
"29442809713893014097360319726760739566",
"285295838407132926322499123666082004538"
]
},
"source": "https://github.com/libvnc/libvncserver/commit/23e5cbe6b090d7f22982aee909a6a618174d3c2d",
"target": {
"file": "libvncclient/rfbproto.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:50:33Z"
}
}
],
"modified": "2026-10-20T13:50:33.232716868Z",
"provider": "osv",
"references": [
"https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13",
"https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html",
"https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html",
"https://usn.ubuntu.com/4434-1/",
"https://bugzilla.redhat.com/show_bug.cgi?id=1860354",
"https://github.com/LibVNC/libvncserver/commit/23e5cbe6b090d7f22982aee909a6a618174d3c2d"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
"cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
},
{
"introduced": "15.2"
},
{
"last_affected": "15.2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-14399",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388273,
"published_at": "2020-06-17T16:15:11.93+00:00"
}