What is CVE-2018-6923?

CVE-2018-6923 is a high-severity vulnerability in FreeBSD, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-09-04.

How severe is CVE-2018-6923?

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

Resource exhaustion in FreeBSD

CVE-2018-6923

In FreeBSD before 11.1-STABLE, 11.2-RELEASE-p2, 11.1-RELEASE-p13, ip fragment reassembly code is vulnerable to a denial of service due to excessive system resource consumption. This issue can allow a remote attacker who is able to send an arbitrary ip fragments to cause the machine to consume excessive resources.

Vulnerability class: DoS (Denial of Service)

Published 2018-09-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.040 (90.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.040 · newest: 0.040 · change: 0.000

Affected products

FreeBSD — versions 8.3, 11.0, 7.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.securityfocus.com/bid/105336 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1041505 (VDB Entry, Third Party Advisory, vdb-entry)
www.freebsd.org/security/advisories/FreeBSD-SA-18:10.ip.asc (vendor-advisory, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2018-6923?: CVE-2018-6923 is a high-severity vulnerability in FreeBSD, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-09-04.
How severe is CVE-2018-6923?: High severity. CVSS v3 base score is 7.5 out of 10.