Riskcovery

CVE-2025-20340

Cisco IOS XR Address Resolution Protocol Broadcast Storm Vulnerability

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

Read the record on cve.org

Description

A vulnerability in the Address Resolution Protocol (ARP) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a broadcast storm, leading to a denial of service (DoS) condition on an affected device. 

This vulnerability is due to how Cisco IOS XR Software processes a high, sustained rate of ARP traffic hitting the management interface. Under certain conditions, an attacker could exploit this vulnerability by sending an excessive amount of traffic to the management interface of an affected device, overwhelming its ARP processing capabilities. A successful exploit could result in degraded device performance, loss of management connectivity, and complete unresponsiveness of the system, leading to a DoS condition.

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-400 Uncontrolled Resource Consumption

Affected Products

ProductVersions
Cisco IOS XR SoftwareCisco
  • 6.5.3Affected
  • 6.5.29Affected
  • 6.5.1Affected
  • 6.6.1Affected
  • 6.5.2Affected
  • 6.5.92Affected
  • 6.5.15Affected
  • 6.6.2Affected
  • 7.0.1Affected
  • 6.6.25Affected
  • 6.5.26Affected
  • 6.6.11Affected
  • 6.5.25Affected
  • 6.5.28Affected
  • 6.5.93Affected
  • 6.6.12Affected
  • 6.5.90Affected
  • 7.0.0Affected
  • 7.1.1Affected
  • 7.0.90Affected
  • 6.6.3Affected
  • 6.7.1Affected
  • 7.0.2Affected
  • 7.1.15Affected
  • 7.2.0Affected
  • and 80 more versions

References

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