CVE-2018-6918

Name: CVE-2018-6918
Creator: NVD / NIST
Published: 2018-04-04T14:29:00.293+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.38%

Last modified Jun 17, 2026

CVE-2018-6918 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.38% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.38%

90.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	>= 10.0, < 10.4
Freebsd	Freebsd	>= 11.0, < 11.1

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

Timeline

Published: Apr 4, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6918?

How severe is CVE-2018-6918?

Severity scoring for CVE-2018-6918 is pending analysis. The EPSS model estimates a 4.38% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6918?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6918?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST