Description
A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload. This vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco NX-OS Software | 9.2(3); 7.0(3)I5(2); 6.0(2)A8(7a); 7.0(3)I4(5); 7.0(3)I4(6); 7.0(3)I4(3); 9.2(2v); 7.0(3)I4(7); 7.0(3)I4(1); 7.0(3)I4(8); 7.0(3)I4(2); 6.0(2)A8(11); 9.2(1); 9.2(2t); 9.2(3y); 7.0(3)I4(1t); 7.0(3)I7(6z); 9.3(2); 7.0(3)F3(3); 7.0(3)I7(3z) |
References
Timeline
- Published
- Aug 27, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred