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Fencer Vulns
medium 6.5

CVE-2020-14405 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-2020-6544

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.

Patch / fix

  • libvnc_project libvncserver 0.9.12
  • siemens simatic_itc1500_firmware 3.2.1.0
  • siemens simatic_itc1500_pro_firmware 3.2.1.0
  • siemens simatic_itc1900_firmware 3.2.1.0
  • siemens simatic_itc1900_pro_firmware 3.2.1.0
  • siemens simatic_itc2200_firmware 3.2.1.0
  • siemens simatic_itc2200_pro_firmware 3.2.1.0
  • libvncserver Debian 14, Debian 13, Debian 12 0.9.13+dfsg-1

debian advisories DEBIAN-CVE-2020-14405

  • 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-2020-14405

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 RHEL 8 0.9.11-17.el8

red hat advisories RHSA-2021:1811

  • libvncserver AlmaLinux 8 0.9.11-17.el8

almalinux advisories ALSA-2021:1811

  • libvncserver Rocky Linux 8 0.9.11-17.el8

rocky linux advisories RLSA-2021:1811

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

alpine advisories ALPINE-CVE-2020-14405

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-2020-14405 updated cvss 6.5

libvncserver: libvncclient/rfbproto.c does not limit TextChat size

  • Red Hat Enterprise Linux 6 libvncserver
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libvncserver
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) libvncserver-devel 0.9.11-17.el8, libvncserver-debuginfo 0.9.11-17.el8, libvncserver-debugsource 0.9.11-17.el8 Red Hat Enterprise Linux AppStream (v. 8) libvncserver 0.9.11-17.el8
    fixed: vendor fix RHSA-2021:1811
  • Red Hat Enterprise Linux 6 vino Red Hat Enterprise Linux 7 vino Red Hat Enterprise Linux 8 vino
    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

cisa ICSA-21-350-12 updated cvss 6.5

Siemens SIMATIC ITC

  • Siemens SIMATIC ITC1500 V3 <V3.2.1.0 Siemens SIMATIC ITC1500 V3 PRO <V3.2.1.0 Siemens SIMATIC ITC1900 V3 <V3.2.1.0 Siemens SIMATIC ITC1900 V3 PRO <V3.2.1.0 Siemens SIMATIC ITC2200 V3 <V3.2.1.0 Siemens SIMATIC ITC2200 V3 PRO <V3.2.1.0
    affected: fixed in V3.2.1.0, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.91% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.