CVE-2018-6922
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.
Does this matter?
Lower severity and a low EPSS score (3.19%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 3.19% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- freebsd/freebsd
- Source
- secteam@freebsd.org
EPSS 3.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.