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CVE-2016-9942

9.8 · CRITICAL

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a c…

Published Dec 31, 2016CWE-119EPSS 3.82%

Overview

CVE-2016-9942 is a critical-severity vulnerability. It was published on December 31, 2016 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

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

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

Refwww.debian.org/security/2017/dsa-3753Refwww.securityfocus.com/bid/95170GitHubgithub.com/LibVNC/libvncserver/pull/137GitHubgithub.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11Reflists.debian.org/debian-lts-announce/2019/10/msg00042.htmlRefsecurity.gentoo.org/glsa/201702-24Refusn.ubuntu.com/4587-1/Refwww.debian.org/security/2017/dsa-3753Refwww.securityfocus.com/bid/95170GitHubgithub.com/LibVNC/libvncserver/pull/137

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9942?

CVE-2016-9942 is a critical-severity vulnerability. It was published on December 31, 2016 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2016-9942?

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-2016-9942?

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-2016-9942?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9942 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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