CVE-2018-6922

Name: CVE-2018-6922
Creator: NVD / NIST
Published: 2018-08-09T18:29:00.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.23%

Last modified Jun 17, 2026

CVE-2018-6922 is a vulnerability of currently unknown severity. 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. EPSS estimates a 3.23% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

3.23%

86.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	10.4
Freebsd	Freebsd	11.1
Freebsd	Freebsd	11.2

References

http://www.securityfocus.com/bid/105058Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041425Third Party Advisory, VDB Entry
https://security.netapp.com/advisory/ntap-20180815-0002/Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascPatch, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlPatch
http://www.securityfocus.com/bid/105058Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041425Third Party Advisory, VDB Entry
https://security.netapp.com/advisory/ntap-20180815-0002/Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascPatch, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlPatch

Timeline

Published: Aug 9, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6922?

How severe is CVE-2018-6922?

Severity scoring for CVE-2018-6922 is pending analysis. The EPSS model estimates a 3.23% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6922?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6922?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST