CVSS 3.1 Score 8.8 of 10 (high)


Published Dec 19, 2023
Updated: Feb 2, 2024
CWE ID 787


CVE-2023-6856 is a vulnerability that affects Firefox ESR versions prior to 115.6, Thunderbird versions prior to 115.6, and Firefox versions prior to 121. The vulnerability is related to the WebGL DrawElementsInstanced method and can lead to a heap buffer overflow on systems with the Mesa VM driver, potentially allowing an attacker to execute remote code and escape sandboxing. The vulnerability has a high severity rating with a base score of 8.8 according to It requires user interaction and can impact the confidentiality and integrity of an organization's data. No remediation information is provided in the given text.

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