CVE-2019-5599: n/a FreeBSD vulnerability

CVE-2019-5599: In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RAC...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 20:01 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2019-5599 is a denial-of-service flaw in FreeBSD 12.0 when the non-default RACK TCP stack is enabled. A remote attacker could force kernel TCP data structures to grow and make packet processing increasingly expensive, exhausting resources and disrupting availability. Exposure is most likely on FreeBSD 12.0 systems or vendor appliances based on affected FreeBSD builds where RACK was enabled. Because RACK is described as non-default, many default installations may not be exposed. Treat this as an availability risk, not a data-theft issue. Prioritize exposed FreeBSD 12.0 systems and appliances where service downtime would materially affect operations, especially if RACK is enabled. Mitigation focus: Upgrade FreeBSD 12.0-RELEASE systems to 12.0-RELEASE-p6 or later.; Upgrade FreeBSD 12.0-STABLE systems to r349197 or later.; Confirm whether the non-default RACK TCP stack is enabled..

Prepared: Jun 6, 2026, 20:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jul 2, 2019, 20:02 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdCVE reference · x_refsource_MISC
FreeBSD-SA-19:08CVE reference · vendor-advisory, x_refsource_FREEBSD
VU#905115CVE reference · third-party-advisory, x_refsource_CERT-VN
20190624 FreeBSD Security Advisory FreeBSD-SA-19:08.rackCVE reference · mailing-list, x_refsource_BUGTRAQ
https://support.f5.com/csp/article/K75521003CVE reference · x_refsource_MISC
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193CVE reference · x_refsource_MISC
https://security.netapp.com/advisory/ntap-20190625-0004/CVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/aFreeBSDFreeBSD 12.0 before 12.0-RELEASE-p6Listed

Weakness

CWE details

No CWE listed

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