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CVE-2018-20020
CRITICAL
LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution
Published: Dec 19, 2018
Modified: Jun 17, 2026
CWE-787
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (7)
| Vendor | Product | Version |
|---|---|---|
| libvnc_project | libvncserver | * < 0.9.12 |
| canonical | ubuntu_linux | 14.04 |
| canonical | ubuntu_linux | 16.04 |
| canonical | ubuntu_linux | 18.04 |
| canonical | ubuntu_linux | 18.10 |
| debian | debian_linux | 8.0 |
| debian | debian_linux | 9.0 |
GitHub Security Advisory GHSA-v93r-hw5v-g7wc
LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write...
References (22)
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/ Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
- https://security.gentoo.org/glsa/201908-05
- https://security.gentoo.org/glsa/202006-06
- https://usn.ubuntu.com/3877-1/ Third Party Advisory
- https://usn.ubuntu.com/4547-1/
- https://usn.ubuntu.com/4547-2/
- https://usn.ubuntu.com/4587-1/
- https://www.debian.org/security/2019/dsa-4383 Third Party Advisory
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/ Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
8.62%
Top 5% most likely to be exploited
Threat Score
41.8 / 100
Data Sources
NVD
EPSS
GitHub