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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (52.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- FreeBSD — versions 14.0, 14.0-RELEASE, 13.2
Public proof-of-concept exploits
References
- security.freebsd.org/advisories/FreeBSD-SA-23:17.pf.asc (vendor-advisory, Vendor Advisory)
- security.netapp.com/advisory/ntap-20240112-0007/
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.