CVE-2023-3107

Remote denial of service in IPv6 fragment reassembly

Published Aug 1, 2023 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service.

Remediation

Vendor Workaround

Users with IPv6 disabled on untrusted network interfaces are not affected. Such interfaces will have the IFDISABLED nd6 flag set in ifconfig(8). The kernel may be configured to drop all IPv6 fragments by setting the net.inet6.ip6.maxfrags sysctl to 0. Doing so will prevent the bug from being triggered, with the caveat that legitimate IPv6 fragments will be dropped. If the pf(4) firewall is enabled, and scrubbing and fragment reassembly is enabled on untrusted interfaces, the bug cannot be triggered. This is the default if pf(4) is enabled.

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
EUVD EUVD EUVD-2023-43794 A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service.
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00125}

epss

{'score': 0.00163}

Type Values Removed Values Added
Description A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service. A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service.
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
freebsd
Published
Updated
Jul 9, 2025, 1:45 PM
Reserved
Jun 5, 2023, 2:10 PM
Status
Modified
Published
Aug 1, 2023, 11:15 PM
Modified
Jun 17, 2026, 6:13 AM