What’s Vulnerable › Vulnerabilities
CVE-2020-14405
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-06-17 · updated 2026-06-17
- Weakness: CWE-770
Description
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.
Affected products
- Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
- Debian Linux: 8.0, 9.0
- Libvnc Project Libvncserver: before 0.9.12 — fixed in 0.9.12
- Siemens Simatic Itc1500 Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
- Siemens Simatic Itc1500 Pro Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
- Siemens Simatic Itc1900 Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
- Siemens Simatic Itc1900 Pro Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
- Siemens Simatic Itc2200 Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
- Siemens Simatic Itc2200 Pro Firmware: from 3.0.0.0 before 3.2.1.0 — fixed in 3.2.1.0
How to fix
Upgrade to a fixed version: 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. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/commit/8937203441ee241c4ace85da687b7d6633a12365
- https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13
- https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html
- https://usn.ubuntu.com/4434-1/
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/commit/8937203441ee241c4ace85da687b7d6633a12365
- https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13
- https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html
- https://usn.ubuntu.com/4434-1/
Get alerted when CVE-2020-14405 or the next vulnerability affects your stack