CVSS 3.1 Score 6.5 of 10 (medium)


Published Nov 21, 2023
Updated: Nov 30, 2023
CWE ID 416


CVE-2023-6205 is a vulnerability that affects Firefox versions prior to 120, Firefox ESR versions prior to 115.5.0, and Thunderbird versions prior to 115.5.0. This vulnerability allows an attacker to cause the use of a MessagePort after it has been freed, potentially leading to an exploitable crash. The vulnerability has a base severity of MEDIUM and a base score of 6.5 according to It requires user interaction and can be exploited over a network. The impact score is 3.6, with no integrity or confidentiality impact but high availability impact. The exploitability score is 2.8, and the attack complexity is low. Remediation for this vulnerability involves updating the affected products to their respective patched versions as specified by the vendor.

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