CVE-2025-20241
published 2025-08-27CVE-2025-20241: 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…
PriorityP340high7.4CVSS 3.1
AVAACLPRNUINSCCNINAH
EPSS
0.27%
18.2th percentile
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.
Affected
128 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
| cisco | cisco_nx-os_software | — | — |
CVSS provenance
nvdv3.17.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
vendor_cisco7.4HIGH
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Cisco
Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
vendor_cisco·2025-08-27·CVSS 7.4
CVE-2025-20241 [HIGH] CWE-733 Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
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 affec
Cisco
Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
vendor_cisco·CVSS 3.1
CVE-2025-20241 Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
CVE-2025-20241: Cisco Nexus 3000 and 9000 Series Switches Intermediate System-to-Intermediate System Denial of Service Vulnerability
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 c
GHSA
GHSA-9xhv-jrcw-j6fj: A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cis
ghsa_unreviewed·2025-08-27
CVE-2025-20241 [HIGH] CWE-733 GHSA-9xhv-jrcw-j6fj: A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cis
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
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-08-27
Published