CVE-2016-1409: The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS XE 2.1 through 3.17S, IO...

Security readout for executives and security teams

This flaw can let a remote attacker disrupt packet processing on affected Cisco network devices by sending crafted IPv6 Neighbor Discovery messages. The business risk is network outage, not data theft. The CVE states it was exploited in the wild in May 2016, but the bundle does not show current active exploitation. Exposure is most likely on IPv6-enabled Cisco routing or switching platforms running the listed IOS XE, IOS XR, or NX-OS ranges. Devices reachable by untrusted IPv6 Neighbor Discovery traffic have the highest concern. The bundle also references a Huawei advisory, but does not provide affected Huawei product details. Prioritize remediation where affected Cisco devices support critical connectivity or face untrusted IPv6 traffic. The main business impact is outage of network services. Historical exploitation raises urgency, but current exploitation is not evidenced in this bundle. Mitigation focus: Review the Cisco advisory for fixed software and product-specific guidance.; Upgrade affected IOS XE, IOS XR, and NX-OS devices per vendor guidance.; Check the Huawei advisory only for Huawei environments; details are not in the bundle..

Prepared

Jun 13, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.