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Vulnerability details: VCID-h6bh-4m2d-5kdp
Vulnerability ID VCID-h6bh-4m2d-5kdp
Aliases CVE-2018-20024
Summary LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-476 NULL Pointer Dereference
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20024.json
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
epss 0.02823 https://api.first.org/data/v1/epss?cve=CVE-2018-20024
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2018-20024
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-20024
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20024.json
https://api.first.org/data/v1/epss?cve=CVE-2018-20024
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-18-034-libvnc-null-pointer-dereference/
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
1661132 https://bugzilla.redhat.com/show_bug.cgi?id=1661132
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-2018-20024 https://nvd.nist.gov/vuln/detail/CVE-2018-20024
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:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20024.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:N/I:N/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:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20024
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:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20024
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 0.85613
EPSS Score 0.02823
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:36:00.683110+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4547-2/ 37.0.0