CVE-2019-5599

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-07-02 · updated 2026-06-17
Weakness: CWE-770

Description

In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service.

Affected products

FreeBSD: 12.0, 12.0-p1, 12.0-p2, 12.0-p3, 12.0-p4, 12.0-p5

References

http://packetstormsecurity.com/files/153329/Linux-FreeBSD-TCP-Based-Denial-Of-Service.html
http://packetstormsecurity.com/files/153378/FreeBSD-Security-Advisory-FreeBSD-SA-19-08.rack.html
http://www.openwall.com/lists/oss-security/2019/06/17/5
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
https://seclists.org/bugtraq/2019/Jun/27
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:08.rack.asc
https://security.netapp.com/advisory/ntap-20190625-0004/
https://support.f5.com/csp/article/K75521003
https://www.kb.cert.org/vuls/id/905115
http://packetstormsecurity.com/files/153329/Linux-FreeBSD-TCP-Based-Denial-Of-Service.html
http://packetstormsecurity.com/files/153378/FreeBSD-Security-Advisory-FreeBSD-SA-19-08.rack.html

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