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Vulnerability record · CVE-2019-5599 · published 2 July 2019

CVE-2019-5599: Freebsd allocation without limits vulnerability

Freebsd · Freebsd

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.

7.5 CVSS 3.0 High EPSS 5.1% · top 8.0% CWE-770 · Allocation without limits
7.5CVSS 3.0 base score, v2 7.8
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-5599), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.