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CVE-2023-6856

8.8 · HIGH

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver.

Published Dec 19, 2023CWE-787EPSS 20.63%

Overview

CVE-2023-6856 is a high-severity vulnerability. It was published on December 19, 2023 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

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

Refbugzilla.mozilla.org/show_bug.cgi?id=1843782Reflists.debian.org/debian-lts-announce/2023/12/msg00020.htmlReflists.debian.org/debian-lts-announce/2023/12/msg00021.htmlRefsecurity.gentoo.org/glsa/202401-10Refwww.debian.org/security/2023/dsa-5581Refwww.debian.org/security/2023/dsa-5582Refwww.mozilla.org/security/advisories/mfsa2023-54/Refwww.mozilla.org/security/advisories/mfsa2023-55/Refwww.mozilla.org/security/advisories/mfsa2023-56/Refbugzilla.mozilla.org/show_bug.cgi?id=1843782

How CyberStrike helps

Frequently asked questions

What is CVE-2023-6856?

CVE-2023-6856 is a high-severity vulnerability. It was published on December 19, 2023 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2023-6856?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-6856?

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-2023-6856?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-6856 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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