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CVE-2018-20020

9.8 · 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, 2018CWE-787EPSS 8.62%

Overview

CVE-2018-20020 is a critical-severity vulnerability. It was published on December 19, 2018 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/Reflists.debian.org/debian-lts-announce/2018/12/msg00017.htmlReflists.debian.org/debian-lts-announce/2019/10/msg00042.htmlReflists.debian.org/debian-lts-announce/2019/11/msg00033.htmlRefsecurity.gentoo.org/glsa/201908-05Refsecurity.gentoo.org/glsa/202006-06Refusn.ubuntu.com/3877-1/Refusn.ubuntu.com/4547-1/Refusn.ubuntu.com/4547-2/Refusn.ubuntu.com/4587-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20020?

CVE-2018-20020 is a critical-severity vulnerability. It was published on December 19, 2018 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2018-20020?

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20020?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-20020?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20020 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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