High
Security advisory
An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-14398
- 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. An improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c.
osv:CVE-2020-14398
Complete source record
{
"id": "b918a34d6e9f5679f08e4d9c7ea19f9def51258cf4c29e80bd4800cbbdb10893",
"url": "https://osv.dev/vulnerability/CVE-2020-14398",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-14398",
"summary": "An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c.",
"evidence": "osv:CVE-2020-14398",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-14398",
"aliases": [
"CVE-2020-14398"
],
"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"
},
{
"last_affected": "0a70095271d845d16a3ed17354841b01f33963ad"
},
{
"fixed": "57433015f856cc12753378254ce4f1c78f5d9c7b"
}
],
"database_specific": {
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{
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"range": [
{
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},
{
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}
],
"source": "CPE_RANGE"
},
{
"range": [
{
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],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"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-2020-14398.json",
"vanir_signatures": [
{
"id": "CVE-2020-14398-475aebc7",
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"source": "https://github.com/libvnc/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b",
"target": {
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{
"id": "CVE-2020-14398-698de838",
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},
"source": "https://github.com/libvnc/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b",
"target": {
"file": "rfb/rfbclient.h"
},
"deprecated": false,
"signature_type": "Line",
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{
"id": "CVE-2020-14398-c26dc7dd",
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"source": "https://github.com/libvnc/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b",
"target": {
"file": "libvncclient/vncviewer.c"
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"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
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{
"id": "CVE-2020-14398-c3c16db2",
"digest": {
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"function_hash": "254707495691174405563156847212044692456"
},
"source": "https://github.com/libvnc/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b",
"target": {
"file": "libvncclient/vncviewer.c",
"function": "rfbGetClient"
},
"deprecated": false,
"signature_type": "Function",
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},
{
"id": "CVE-2020-14398-d84cf98c",
"digest": {
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"function_hash": "54417766686695289676091539773525012280"
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"source": "https://github.com/libvnc/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b",
"target": {
"file": "libvncclient/sockets.c",
"function": "ReadFromRFBServer"
},
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"signature_type": "Function",
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],
"vanir_signatures_modified": "2026-10-20T13:50:32Z"
}
}
],
"modified": "2026-10-20T13:50:32.399307849Z",
"provider": "osv",
"references": [
"https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13",
"https://usn.ubuntu.com/4434-1/",
"https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf",
"https://github.com/LibVNC/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b"
],
"provider_metadata": {
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],
"vendor_product": "siemens:simatic_itc1500_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
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]
},
{
"cpes": [
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],
"vendor_product": "siemens:simatic_itc1500_pro_firmware",
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{
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},
{
"cpes": [
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],
"vendor_product": "siemens:simatic_itc1900_firmware",
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{
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{
"cpes": [
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"extracted_events": [
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{
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],
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]
},
{
"cpes": [
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],
"vendor_product": "siemens:simatic_itc2200_firmware",
"extracted_events": [
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{
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},
{
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},
{
"cpes": [
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"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
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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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},
{
"cpes": [
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],
"vendor_product": "debian:debian_linux",
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{
"range": [
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{
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},
{
"cpes": [
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],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
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{
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],
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},
"related_cves": [
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"value": "CVE-2020-14398",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388271,
"published_at": "2020-06-17T16:15:11.837+00:00"
}