CVE-2026-20074

The CVE concerns Cisco IOS XR Software’s IS-IS multi-instance routing feature. An unauthenticated, Layer-2 adjacent attacker can trigger the IS-IS process to restart by sending crafted ingress IS-IS packets after forming an adjacency, due to insufficient input validation. The resulting impact is ...

Cisco IOS Software Intermediate System to Intermediate System DoS (cisco-sa-isis-sGjyOUHX)

According to its self-reported version, Cisco IOS is affected by a vulnerability. - A vulnerability in the Intermediate System-to-Intermediate System IS-IS protocol of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service DoS...

CVE-2019-16027

A vulnerability in the implementation of the Intermediate SystemtoIntermediate System ISIS routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service DoS condition in the ISIS process. The vulnerability is due to improper...