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CVE-2019-5597

9.1 · CRITICAL

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…

Published May 15, 2019CWE-20EPSS 3.66%

Overview

CVE-2019-5597 is a critical-severity vulnerability. It was published on May 15, 2019 and has a CVSS 3.0 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.htmlRefwww.securityfocus.com/bid/108395Refsecurity.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.ascRefsecurity.netapp.com/advisory/ntap-20190611-0001/Refwww.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlRefwww.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdfRefpacketstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.htmlRefwww.securityfocus.com/bid/108395Refsecurity.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.ascRefsecurity.netapp.com/advisory/ntap-20190611-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-5597?

CVE-2019-5597 is a critical-severity vulnerability. It was published on May 15, 2019 and has a CVSS 3.0 base score of 9.1 (CRITICAL).

How severe is CVE-2019-5597?

This vulnerability has a CVSS 3.0 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-5597?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-5597?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-5597 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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