{"id":"CVE-2018-6922","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-6922","generatedAt":"2026-10-29T00:33:36.054Z","title":"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.","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.","published":"2018-08-09T18:29:00.000Z","lastModified":"2026-06-17T02:02:28.000Z","status":"Modified","sourceIdentifier":"secteam@freebsd.org","cvss":{"version":"3.0","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-400"],"affected":["freebsd/freebsd"],"epss":{"score":0.03185,"percentile":0.88013,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (3.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/105058","tags":["Third Party Advisory","VDB Entry"],"source":"secteam@freebsd.org"},{"url":"http://www.securitytracker.com/id/1041425","tags":["Third Party Advisory","VDB Entry"],"source":"secteam@freebsd.org"},{"url":"https://security.netapp.com/advisory/ntap-20180815-0002/","tags":["Third Party Advisory"],"source":"secteam@freebsd.org"},{"url":"https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc","tags":["Patch","Vendor Advisory"],"source":"secteam@freebsd.org"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","tags":["Patch"],"source":"secteam@freebsd.org"},{"url":"http://www.securityfocus.com/bid/105058","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1041425","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20180815-0002/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-6922","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}