Critical severity9.1NVD Advisory· Published May 15, 2019· Updated Jun 17, 2026
CVE-2019-5597
CVE-2019-5597
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
14cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:*+ 11 more
- cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p2:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p3:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p4:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p5:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p6:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p7:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:11.2:p9:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:12.0:-:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:12.0:p1:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:12.0:p3:*:*:*:*:*:*
- (no CPE)range: < 11.3-PRERELEASE, < 12.0-STABLE before r347591, < 11.2-RELEASE-p10, < 12.0-RELEASE-p4
- FreeBSD/FreeBSDdescription
Patches
Vulnerability mechanics
References
6- security.freebsd.org/advisories/FreeBSD-SA-19:05.pf.ascnvdPatchVendor Advisory
- www.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdfnvdExploitThird Party Advisory
- packetstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.htmlnvdThird Party AdvisoryVDB Entry
- www.securityfocus.com/bid/108395nvd
- security.netapp.com/advisory/ntap-20190611-0001/nvd
- www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlnvd
News mentions
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