Vulnerability Monitor

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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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and limited availability for affected systems. Impacting 1 product from freebsd organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2018, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2018-08-09T18:29:00.277

Last Modified

2024-11-21T04:11:25.750

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-400
Type: Primary
CWE-400

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	10.4	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.1	Yes
Operating System	freebsd	freebsd	11.2	Yes

References

http://www.securityfocus.com/bid/105058 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1041425 Third Party Advisory, VDB Entry ([email protected])
https://security.netapp.com/advisory/ntap-20180815-0002/ Third Party Advisory ([email protected])
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc Patch, Vendor Advisory ([email protected])
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html Patch ([email protected])
http://www.securityfocus.com/bid/105058 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1041425 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20180815-0002/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html Patch (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For freebsd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.