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Vulnerability record · CVE-2019-20788 · published 23 April 2020

CVE-2019-20788: Libvnc project libvncserver integer overflow vulnerability

LLibvnc Project · Libvncserver

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.

9.8 CVSS 3.1 Critical EPSS 2.5% · top 15.8% CWE-190 · Integer overflowCWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.

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
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf PatchThird Party Advisory
https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed PatchThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient ExploitThird Party Advisory
https://usn.ubuntu.com/4407-1/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf PatchThird Party Advisory
https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed PatchThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient ExploitThird Party Advisory
https://usn.ubuntu.com/4407-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-20788), CISA KEV, FIRST EPSS (scores of 2026-10-06). This page is refreshed as NVD updates the record.