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CVE-2016-9921

6.5 · MEDIUM

Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue.

Published Dec 23, 2016CWE-369EPSS 0.41%

Overview

CVE-2016-9921 is a medium-severity vulnerability. It was published on December 23, 2016 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS.

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.openwall.com/lists/oss-security/2016/12/09/1Refwww.securityfocus.com/bid/94803Refaccess.redhat.com/errata/RHSA-2017:2392Refaccess.redhat.com/errata/RHSA-2017:2408Reflists.debian.org/debian-lts-announce/2018/09/msg00007.htmlRefsecurity.gentoo.org/glsa/201701-49Refwww.openwall.com/lists/oss-security/2016/12/09/1Refwww.securityfocus.com/bid/94803Refaccess.redhat.com/errata/RHSA-2017:2392Refaccess.redhat.com/errata/RHSA-2017:2408

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9921?

CVE-2016-9921 is a medium-severity vulnerability. It was published on December 23, 2016 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2016-9921?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2016-9921?

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-2016-9921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9921 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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