CVE-2023-6534

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability55. percentile0.7%

Product

Freebsd

PublishedDec 13, 2023

First seenDec 13, 2023

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-23:17.pf.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	12.4, 13.2, 14.0	—

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