7.5
EPSS
0.046%
Advisory Published
Updated

CVE-2023-6534: TCP spoofing vulnerability in pf(4)

First published: Wed Dec 13 2023(Updated: )

In versions of FreeBSD 14.0-RELEASE before 14-RELEASE-p2, FreeBSD 13.2-RELEASE before 13.2-RELEASE-p7 and FreeBSD 12.4-RELEASE before 12.4-RELEASE-p9, the pf(4) packet filter incorrectly validates TCP sequence numbers.  This could allow a malicious actor to execute a denial-of-service attack against hosts behind the firewall.

Credit: secteam@freebsd.org

Affected SoftwareAffected VersionHow to fix
=12.4
=12.4-p1
=12.4-p2
=12.4-p3
=12.4-p4
=12.4-p5
=12.4-p6
=12.4-p7
=12.4-p8
=12.4-rc2-p1
=12.4-rc2-p2
=13.2
=13.2-p1
=13.2-p2
=13.2-p3
=13.2-p4
=13.2-p5
=13.2-p6
=14.0
=14.0-beta5
=14.0-p1
=14.0-rc3
=14.0-rc4-p1

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