Medium
Security advisory
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-14403
- 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. libvncserver/hextile.c allows out-of-bounds access via encodings.
osv:CVE-2020-14403
Complete source record
{
"id": "ee4c65c3b8fb75c41b999c7f218199c1cca1b92d64b8635a431c4f5230f8a868",
"url": "https://osv.dev/vulnerability/CVE-2020-14403",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-14403",
"summary": "An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.",
"evidence": "osv:CVE-2020-14403",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-14403",
"aliases": [
"CVE-2020-14403"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/libvnc/libvncserver",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "0a70095271d845d16a3ed17354841b01f33963ad"
},
{
"fixed": "74e8a70f2c9a5248d6718ce443e07c7ed314dfff"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.9.12"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "74e8a70f2c9a5248d6718ce443e07c7ed314dfff"
}
],
"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-2020-14403.json",
"vanir_signatures": [
{
"id": "CVE-2020-14403-2881c67e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"279186788467601084510397377312630471501",
"136564391502689261425817146893094173910",
"112617782039554860452708764507028252043",
"128154823961943837977491631399247931438"
]
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/hextile.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2020-14403-42bbc5e2",
"digest": {
"threshold": 0.9,
"line_hashes": [
"289252992523367327632354621665320742352",
"36512170735046696879154038989677648515",
"277157400668572645645471330322775066349",
"64330010330190451697336720342933185390"
]
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/rre.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2020-14403-87ba1727",
"digest": {
"length": 1779,
"function_hash": "37231841470234379109527685760802316726"
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/hextile.c",
"function": "bpp"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-14403-c4129626",
"digest": {
"length": 1970,
"function_hash": "15063665914612139429731961338670674392"
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/rre.c",
"function": "bpp"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-14403-eff32b91",
"digest": {
"threshold": 0.9,
"line_hashes": [
"289252992523367327632354621665320742352",
"36512170735046696879154038989677648515",
"277157400668572645645471330322775066349",
"64330010330190451697336720342933185390"
]
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/corre.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2020-14403-f867ff26",
"digest": {
"length": 1933,
"function_hash": "276190757486447906599022657754585572557"
},
"source": "https://github.com/libvnc/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff",
"target": {
"file": "libvncserver/corre.c",
"function": "bpp"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:50:30Z"
}
}
],
"modified": "2026-10-20T13:50:30.445983302Z",
"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://usn.ubuntu.com/4573-1/",
"https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf",
"https://github.com/LibVNC/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc1500_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc1500_pro_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc1900_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc1900_pro_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc2200_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:simatic_itc2200_pro_firmware",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0.0"
},
{
"fixed": "3.2.1.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "18.10"
},
{
"last_affected": "18.10"
},
{
"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"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-14403",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388268,
"published_at": "2020-06-17T16:15:12.213+00:00"
}