Riskcovery

CVE-2025-20241

Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TBD> Denial of Service Vulnerability

State
Published
Severity
7.4 High
Published
Aug 27, 2025
Updated
Aug 27, 2025
Reserved
Oct 10, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.4 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hcisco

Weaknesses

  • CWE-733 Compiler Optimization Removal or Modification of Security-critical Code

Affected Products

ProductVersions
Cisco NX-OS SoftwareCisco
  • 9.2(3)Affected
  • 7.0(3)I5(2)Affected
  • 6.0(2)A8(7a)Affected
  • 7.0(3)I4(5)Affected
  • 7.0(3)I4(6)Affected
  • 7.0(3)I4(3)Affected
  • 9.2(2v)Affected
  • 7.0(3)I4(7)Affected
  • 7.0(3)I4(1)Affected
  • 7.0(3)I4(8)Affected
  • 7.0(3)I4(2)Affected
  • 6.0(2)A8(11)Affected
  • 9.2(1)Affected
  • 9.2(2t)Affected
  • 9.2(3y)Affected
  • 7.0(3)I4(1t)Affected
  • 7.0(3)I7(6z)Affected
  • 9.3(2)Affected
  • 7.0(3)F3(3)Affected
  • 7.0(3)I7(3z)Affected
  • 7.0(3)IM7(2)Affected
  • 6.0(2)A8(11b)Affected
  • 7.0(3)I7(5a)Affected
  • 7.0(3)I6(1)Affected
  • 7.0(3)I5(3b)Affected
  • and 102 more versions

References

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