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Vulnerability details: VCID-5tjh-9zqh-rbcz
Vulnerability ID VCID-5tjh-9zqh-rbcz
Aliases CVE-2018-20020
Summary LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-416 Use After Free
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20020.json
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
epss 0.16827 https://api.first.org/data/v1/epss?cve=CVE-2018-20020
cvssv3 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-20020
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-20020
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20020.json
https://api.first.org/data/v1/epss?cve=CVE-2018-20020
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15126
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15127
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20019
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20020
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20021
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20022
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20023
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20024
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-21247
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6307
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
https://security.gentoo.org/glsa/201908-05
https://security.gentoo.org/glsa/202006-06
https://www.debian.org/security/2019/dsa-4383
1661117 https://bugzilla.redhat.com/show_bug.cgi?id=1661117
916941 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916941
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:*:*:*: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: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-2018-20020 https://nvd.nist.gov/vuln/detail/CVE-2018-20020
USN-3877-1 https://usn.ubuntu.com/3877-1/
USN-4547-1 https://usn.ubuntu.com/4547-1/
USN-4547-2 https://usn.ubuntu.com/4547-2/
USN-4587-1 https://usn.ubuntu.com/4587-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20020.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:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 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:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20020
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20020
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 0.94667
EPSS Score 0.16827
Published At Aug. 14, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:36:00.631629+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4547-2/ 37.0.0