Cisco IOS XR up to 24.2.11 IKEv2 allocation of resources

Summaryinfo

A vulnerability labeled as critical has been found in Cisco IOS XR. This affects an unknown function of the component IKEv2 Handler. Such manipulation leads to allocation of resources. This vulnerability is uniquely identified as CVE-2025-20209. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco IOS XR. It has been rated as critical. Affected by this issue is an unknown part of the component IKEv2 Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.  This vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability is handled as CVE-2025-20209 since 10/10/2024. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/01/2025). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XR

Version

• 6.5.1
• 6.5.2
• 6.5.3
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.25
• 7.0.0
• 7.0.1
• 7.0.2
• 7.1.1
• 7.1.2
• 7.2.0
• 7.2.1
• 7.2.2
• 7.3.1
• 7.3.2
• 7.3.27
• 7.4.1
• 7.4.2
• 7.5.1
• 7.5.2
• 7.6.1
• 7.6.2
• 7.7.1
• 7.7.2
• 7.7.21
• 7.8.1
• 7.8.2
• 7.8.22
• 7.9.1
• 7.9.2
• 7.10.1
• 7.10.2
• 7.11.1
• 7.11.2
• 24.1.1
• 24.1.2
• 24.2.1
• 24.2.11

License

• commercial

Website

• Vendor: https://www.cisco.com/

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