CVE-2011-2393: Freebsd

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in FreeBSD, NetBSD, and possibly other BSD-based operating systems allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, a similar vulnerability to CVE-2010-4670.

Affected products

• Freebsd Freebsd: any version
• Netbsd Netbsd: any version

Published 2012-02-02. Last modified 2026-06-16.