CVE-2018-20024

HIGHNVD 7.57.5—

7.5

LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 88.2%
KEV: Not listed

Published

December 19, 2018

Last Modified

November 21, 2024

References (22)

vulnerability@kasperskyhttps://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/
vulnerability@kasperskyhttps://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
vulnerability@kasperskyhttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
vulnerability@kasperskyhttps://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
vulnerability@kasperskyhttps://security.gentoo.org/glsa/201908-05
vulnerability@kasperskyhttps://security.gentoo.org/glsa/202006-06
vulnerability@kasperskyhttps://usn.ubuntu.com/3877-1/
vulnerability@kasperskyhttps://usn.ubuntu.com/4547-1/
vulnerability@kasperskyhttps://usn.ubuntu.com/4547-2/
vulnerability@kasperskyhttps://usn.ubuntu.com/4587-1/
vulnerability@kasperskyhttps://www.debian.org/security/2019/dsa-4383
af854a3a-2127-422b-91ae-364da2661108https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libvncserver1 (0.9.11+dfsg-1ubuntu1.1) @ bionic	2026-05-28	ubuntu
ubuntu	libitalccore (1:3.0.3+dfsg1-3ubuntu0.1) @ bionic	2026-05-28	ubuntu
ubuntu	ssvnc (1.0.29-2+deb8u1build0.16.04.1) @ xenial	2026-05-28	ubuntu
ubuntu	libitalccore (1:2.0.2+dfsg1-4ubuntu0.1) @ xenial	2026-05-28	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-476NULL Pointer Dereference

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 00:11 UTCEG score recompute
2026-05-28 00:11 UTCVendor advisory
2026-05-28 00:10 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-20024?

CVE-2018-20024 is a high vulnerability published on December 19, 2018. LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.

When was CVE-2018-20024 disclosed?

CVE-2018-20024 was first published in the National Vulnerability Database on December 19, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20024 actively exploited?

CVE-2018-20024 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-20024?

CVE-2018-20024 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-20024?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20024, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-20024

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CVE-2018-20024

Published

Last Modified

References (22)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20024?

Same vendor

Same CWE

CVE-2018-20024

📅 Published

🔄 Last Modified

🔗 References (22)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20024?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

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Published

Last Modified

References (22)

Frequently asked(5)

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