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Vulnerability details: VCID-21gw-wymt-j3gb
Vulnerability ID VCID-21gw-wymt-j3gb
Aliases CVE-2020-14403
Summary An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-787 Out-of-bounds Write
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 5.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14403.json
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
epss 0.0097 https://api.first.org/data/v1/epss?cve=CVE-2020-14403
cvssv3.1 6.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.5 https://nvd.nist.gov/vuln/detail/CVE-2020-14403
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2020-14403
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14403.json
https://api.first.org/data/v1/epss?cve=CVE-2020-14403
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14403
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/LibVNC/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff
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
1860334 https://bugzilla.redhat.com/show_bug.cgi?id=1860334
cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2020-14403 https://nvd.nist.gov/vuln/detail/CVE-2020-14403
USN-4434-1 https://usn.ubuntu.com/4434-1/
USN-4573-1 https://usn.ubuntu.com/4573-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14403.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:S/C:P/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14403
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14403
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.7569
EPSS Score 0.0097
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:34.750725+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/edge/community.json 37.0.0