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CVE-2018-20024

25
FAUCET Score

CVE-2018-20024 is a null pointer dereference vulnerability in LibVNC's client code, affecting various distributions of Debian and Ubuntu Linux that utilize LibVNC. This flaw, rated with a CVSS score of 7.5 (High), allows an unauthenticated attacker to remotely trigger a Denial of Service (DoS) without user interaction. While no public exploit code or active exploitation has been observed, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.12CPE matchmatch criteria
cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.26%
Probability of exploitation in next 30 days
EPSS Percentile
87.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0326 is in the 77th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libvncserver
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libvncserver
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libvncserver

Vendor Advisories (1)

redhatCVE-2018-20024Low

libvncserver: NULL pointer dereference in VNC client code allows for denial of service

Dec 19, 2018

References

ics-cert.kaspersky.com / advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference
Third Party Advisory
lists.debian.org / debian-lts-announce/2018/12/msg00017.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2019/10/msg00042.html
lists.debian.org / debian-lts-announce/2019/11/msg00033.html
security.gentoo.org / glsa/201908-05
security.gentoo.org / glsa/202006-06
usn.ubuntu.com / 3877-1
Third Party Advisory
usn.ubuntu.com / 4547-1
usn.ubuntu.com / 4547-2
usn.ubuntu.com / 4587-1
debian.org / security/2019/dsa-4383
Third Party Advisory