What’s Vulnerable › Vulnerabilities

CVE-2018-6922

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-09 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• FreeBSD: 10.4, 10.4-p1, 10.4-p3, 10.4-p4, 10.4-p5, 10.4-p6 (+13)

References

• http://www.securityfocus.com/bid/105058
• http://www.securitytracker.com/id/1041425
• https://security.netapp.com/advisory/ntap-20180815-0002/
• https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc
• https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
• http://www.securityfocus.com/bid/105058
• http://www.securitytracker.com/id/1041425
• https://security.netapp.com/advisory/ntap-20180815-0002/
• https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc
• https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

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