Resource exhaustion in Cisco IOS XR - CVE-2025-20340
Published: September 11, 2025
Vulnerability identifier: #VU115157
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20340
CWE-ID: CWE-400
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources in the Address Resolution Protocol (ARP) implementation. A remote attacker on the local network can trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Cisco IOS XR
How to mitigate CVE-2025-20340
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 24.2.21, 25.1.2, 25.2.1