CVE-2025-20209

Description

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.

Reserved 2024-10-10 | Published 2025-03-12 | Updated 2025-03-12 | Assigner cisco

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status
unknown

6.5.3
affected

6.6.1
affected

6.5.2
affected

6.6.2
affected

6.5.1
affected

7.0.1
affected

6.6.25
affected

7.0.0
affected

7.1.1
affected

6.6.3
affected

7.0.2
affected

7.2.0
affected

7.1.2
affected

7.2.1
affected

7.3.1
affected

7.4.1
affected

7.2.2
affected

7.3.2
affected

7.5.1
affected

7.3.27
affected

7.6.1
affected

7.5.2
affected

7.7.1
affected

7.4.2
affected

7.6.2
affected

7.8.1
affected

7.7.2
affected

7.9.1
affected

7.8.2
affected

7.8.22
affected

7.10.1
affected

7.7.21
affected

7.9.2
affected

7.11.1
affected

7.10.2
affected

24.1.1
affected

7.11.2
affected

24.2.1
affected

24.1.2
affected

24.2.11
affected

References

sec.cloudapps.cisco.com/...yAdvisory/cisco-sa-xrike-9wYGpRGq (cisco-sa-xrike-9wYGpRGq)

blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ (Crafting endless AS-PATHS in BGP)

cve.org (CVE-2025-20209)

nvd.nist.gov (CVE-2025-20209)

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