CVSS 3.1 Score 8.8 of 10 (high)


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


CVE-2023-6858 is a high severity 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 a heap buffer overflow in nsTextFragment due to insufficient OOM handling. It has a base score of 8.8 out of 10 and requires user interaction for exploitation. The impact includes high confidentiality and integrity impacts, with the potential for remote attackers to execute arbitrary code or cause a denial of service. To remediate the vulnerability, users should update their affected Firefox and Thunderbird versions to the recommended patches provided by Mozilla.

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