What is CVE-2023-6534?

CVE-2023-6534 is a high-severity vulnerability in Freebsd. CVSS score: 7.5/10. Published 2023-12-13.

How severe is CVE-2023-6534?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-6534 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Freebsd

CVE-2023-6534

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.

EPSS: 0.007 (50.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Freebsd — versions 14.0, 14.0-RELEASE, 13.2

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

secteam@freebsd.org (vendor-advisory, Vendor Advisory)
secteam@freebsd.org

Frequently asked questions

What is CVE-2023-6534?: CVE-2023-6534 is a high-severity vulnerability in Freebsd. CVSS score: 7.5/10. Published 2023-12-13.
How severe is CVE-2023-6534?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-6534 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.