What is CVE-2018-6922?

CVE-2018-6922 is a medium-severity vulnerability in Freebsd, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2018-08-09.

How severe is CVE-2018-6922?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Freebsd

CVE-2018-6922

One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.032 (86.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Freebsd — versions 11.1, 11.2, 10.4

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

secteam@freebsd.org (x_refsource_FREEBSD, vendor-advisory, Patch, Vendor Advisory)
secteam@freebsd.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
secteam@freebsd.org (x_refsource_CONFIRM, Patch)
secteam@freebsd.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
secteam@freebsd.org (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6922?: CVE-2018-6922 is a medium-severity vulnerability in Freebsd, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2018-08-09.
How severe is CVE-2018-6922?: Medium severity. CVSS v3 base score is 5.3 out of 10.