Skip to content
Fencer Vulns
high 7.5

CVE-2020-14399 json

An issue was discovered in LibVNCServer before 0.9.13.

published 2020-06-17 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6538

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly "no trust boundary crossed.

Patch / fix

  • libvncserver_project libvncserver 0.9.13
  • libvncserver Debian 14, Debian 13, Debian 12 0.9.13+dfsg-1

debian advisories DEBIAN-CVE-2020-14399

  • libvncserver Ubuntu 16.04 LTS 0.9.10+dfsg-3ubuntu0.16.04.5
  • libvncserver Ubuntu 18.04 LTS 0.9.11+dfsg-1ubuntu1.3
  • libvncserver Ubuntu 20.04 LTS 0.9.12+dfsg-9ubuntu0.2

ubuntu advisories UBUNTU-CVE-2020-14399

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • LibVNCServer SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 0.9.9-17.31.1
  • LibVNCServer SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 0.9.1-160.19.1
  • LibVNCServer SLE Workstation Extension 15 SP2, SLE Workstation Extension 15 SP1, SLE Module for Package Hub 15 SP2 +1 more 0.9.10-4.22.1

suse advisories SUSE-SU-2020:2167-1SUSE-SU-2020:14424-1SUSE-SU-2020:1922-1

  • LibVNCServer openSUSE Leap 15.2 0.9.10-lp152.9.4.2
  • LibVNCServer openSUSE Leap 15.2 0.9.10-lp152.9.8.1
  • LibVNCServer openSUSE Leap 15.1 0.9.10-lp151.7.9.1

opensuse advisories openSUSE-SU-2020:1056-1openSUSE-SU-2020:1025-1openSUSE-SU-2020:0988-1

  • libvncserver Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 0.9.13-r0

alpine advisories ALPINE-CVE-2020-14399

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14399 updated cvss 0.0

libvncserver: byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c

  • Red Hat Enterprise Linux 6 vino, libvncserver Red Hat Enterprise Linux 7 vino, libvncserver Red Hat Enterprise Linux 8 vino, libvncserver
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.80% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.