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Vulnerability record · CVE-2020-14403 · published 17 June 2020

CVE-2020-14403: Libvnc project libvncserver out-of-bounds write vulnerability

LLibvnc Project · Libvncserver

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.

5.4 CVSS 3.1 Medium EPSS 1.6% · top 24.9% CWE-787 · Out-of-bounds write
5.4CVSS 3.1 base score, v2 5.5
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.

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

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://github.com/LibVNC/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff PatchThird Party Advisory
https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4434-1/ Third Party Advisory
https://usn.ubuntu.com/4573-1/ Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf PatchThird Party Advisory
https://github.com/LibVNC/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff PatchThird Party Advisory
https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4434-1/ Third Party Advisory
https://usn.ubuntu.com/4573-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-14403), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.