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CVE-2018-6922

5.3 · MEDIUM

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.

Published Aug 9, 2018CWE-400EPSS 3.19%

Overview

CVE-2018-6922 is a medium-severity vulnerability. It was published on August 9, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/105058Refwww.securitytracker.com/id/1041425Refsecurity.netapp.com/advisory/ntap-20180815-0002/Refwww.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascRefwww.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlRefwww.securityfocus.com/bid/105058Refwww.securitytracker.com/id/1041425Refsecurity.netapp.com/advisory/ntap-20180815-0002/Refwww.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascRefwww.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-6922?

CVE-2018-6922 is a medium-severity vulnerability. It was published on August 9, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2018-6922?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-6922?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-6922?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-6922 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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