CVE-2019-5609

Name: CVE-2019-5609
Creator: NVD / NIST
Published: 2019-08-30T09:15:20.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2019-5609 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In FreeBSD 12.0-STABLE before r350619, 12.0-RELEASE before 12.0-RELEASE-p9, 11.3-STABLE before r350619, 11.3-RELEASE before 11.3-RELEASE-p2, and 11.2-RELEASE before 11.2-RELEASE-p13, the bhyve e1000 device emulation used a guest-provided value to determine the size of the on-stack buffer without validation when TCP segmentation offload is requested for a transmitted packet. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host.. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

Description

In FreeBSD 12.0-STABLE before r350619, 12.0-RELEASE before 12.0-RELEASE-p9, 11.3-STABLE before r350619, 11.3-RELEASE before 11.3-RELEASE-p2, and 11.2-RELEASE before 11.2-RELEASE-p13, the bhyve e1000 device emulation used a guest-provided value to determine the size of the on-stack buffer without validation when TCP segmentation offload is requested for a transmitted packet. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	11.2
Freebsd	Freebsd	11.3
Freebsd	Freebsd	12.0

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-19:21.bhyve.ascPatch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20190910-0002/Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:21.bhyve.ascPatch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20190910-0002/Third Party Advisory

Timeline

Published: Aug 30, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5609?

How severe is CVE-2019-5609?

CVE-2019-5609 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5609?

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-2019-5609?

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

Scan your code now

Source: NVD / NIST