CVE-2018-6918
This issue can allow a remote attacker who is able to send an arbitrary packet to cause the machine to crash.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In FreeBSD before 11.1-STABLE, 11.1-RELEASE-p9, 10.4-STABLE, 10.4-RELEASE-p8 and 10.3-RELEASE-p28, the length field of the ipsec option header does not count the size of the option header itself, causing an infinite loop when the length is zero. This issue can allow a remote attacker who is able to send an arbitrary packet to cause the machine to crash.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.21% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-835
- Affected
- freebsd/freebsd
- Source
- secteam@freebsd.org
EPSS 4.2% 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://seclists.org/fulldisclosure/2019/Jun/6
- http://www.securityfocus.com/bid/103666Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040628Third Party Advisory, VDB Entry
- https://seclists.org/bugtraq/2019/May/77
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:05.ipsec.ascVendor Advisory
- https://support.apple.com/kb/HT210090
- https://support.apple.com/kb/HT210091
- http://seclists.org/fulldisclosure/2019/Jun/6
- http://www.securityfocus.com/bid/103666Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040628Third Party Advisory, VDB Entry
- https://seclists.org/bugtraq/2019/May/77
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:05.ipsec.ascVendor Advisory
- https://support.apple.com/kb/HT210090
- https://support.apple.com/kb/HT210091
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.