What is CVE-2020-14405?

CVE-2020-14405 is a medium-severity vulnerability in Libvnc Project Libvncserver, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2020-06-17.

How severe is CVE-2020-14405?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Libvnc Project Libvncserver

CVE-2020-14405

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

Published 2020-06-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 (Third Party Advisory, Release Notes)
github.com/LibVNC/libvncserver/commit/8937203441ee241c4ace85da687b7d6633a12365 (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2020/06/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
usn.ubuntu.com/4434-1/ (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2020/08/msg00045.html (mailing-list, Mailing List, Third Party Advisory)
cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-14405?: CVE-2020-14405 is a medium-severity vulnerability in Libvnc Project Libvncserver, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2020-06-17.
How severe is CVE-2020-14405?: Medium severity. CVSS v3 base score is 6.5 out of 10.