Improper input validation in FreeBSD

CVE-2019-5597

In FreeBSD 11.3-PRERELEASE and 12.0-STABLE before r347591, 11.2-RELEASE before 11.2-RELEASE-p10, and 12.0-RELEASE before 12.0-RELEASE-p4, a bug in the pf IPv6 fragment reassembly logic incorrectly uses the last extension header offset from the last received packet instead of the first packet allowing maliciously crafted IPv6 packets to cause a crash or potentially bypass the packet filter.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.037 (89.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2019-5597: held from 0.036 to 0.037.

EPSS over last 30 days · oldest: 0.036 · newest: 0.037 · change: +0.000

Affected products

  • FreeBSD — versions 11.2, 12.0
  • FreeBSD — versions FreeBSD 11.2 before 11.2-RELEASE-p10 and 12.0 before 12.0-RELEASE-p4

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2019-5597?
CVE-2019-5597 is a critical-severity vulnerability in FreeBSD, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2019-05-15.
How severe is CVE-2019-5597?
Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2019-5597 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.