CVSS 3.1 Score 7.5 of 10 (high)


Published Dec 13, 2023
Updated: Jan 12, 2024


CVE-2023-6534 is a vulnerability found in versions of FreeBSD 14.0-RELEASE, FreeBSD 13.2-RELEASE, and FreeBSD 12.4-RELEASE. The issue lies in the pf(4) packet filter's incorrect validation of TCP sequence numbers. This vulnerability could potentially be exploited by malicious actors to launch denial-of-service attacks against hosts behind the firewall. The base severity of this vulnerability is rated as HIGH, with a CVSS score of 7.5, indicating its potential danger to organizations. To remediate this vulnerability, organizations using affected versions of FreeBSD should update to the patched releases such as 14-RELEASE-p2, 13.2-RELEASE-p7, or 12.4-RELEASE-p9 to ensure the proper validation of TCP sequence numbers and prevent potential attacks.

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