CVE-2019-5597

Name: CVE-2019-5597
Creator: NVD / NIST
Published: 2019-05-15T16:29:00.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.63%

Last modified Jun 17, 2026

CVE-2019-5597 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 3.63% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

3.63%

88.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	11.2
Freebsd	Freebsd	12.0

References

http://packetstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.htmlThird Party Advisory, VDB Entry
http://www.securityfocus.com/bid/108395
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.ascPatch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20190611-0001/
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://www.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdfExploit, Third Party Advisory
http://packetstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.htmlThird Party Advisory, VDB Entry
http://www.securityfocus.com/bid/108395
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.ascPatch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20190611-0001/
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://www.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdfExploit, Third Party Advisory

Timeline

Published: May 15, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5597?

How severe is CVE-2019-5597?

Severity scoring for CVE-2019-5597 is pending analysis. The EPSS model estimates a 3.63% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5597?

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-2019-5597?

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

Scan your code now

Source: NVD / NIST