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Vulnerability record · CVE-2018-20019 · published 19 December 2018

CVE-2018-20019: Libvnc project libvncserver out-of-bounds write vulnerability

LLibvnc Project · Libvncserver

LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

9.8 CVSS 3.1 Critical EPSS 9.5% · top 4.7% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
9.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf PatchThird Party Advisory
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-v Broken Link
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201908-05 Third Party Advisory
https://usn.ubuntu.com/3877-1/ Third Party Advisory
https://usn.ubuntu.com/4547-1/ Third Party Advisory
https://usn.ubuntu.com/4587-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4383 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf PatchThird Party Advisory
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-v Broken Link
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201908-05 Third Party Advisory
https://usn.ubuntu.com/3877-1/ Third Party Advisory
https://usn.ubuntu.com/4547-1/ Third Party Advisory
https://usn.ubuntu.com/4587-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4383 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-20019), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.