Vulnerability Details : CVE-2025-20209
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.
Vulnerability category: Denial of service
Products affected by CVE-2025-20209
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Exploit prediction scoring system (EPSS) score for CVE-2025-20209
0.10%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 29 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2025-20209
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
N/A
|
N/A
|
Cisco:cisco-sa-xrike-9wYGpRGq | 2025-03-12 |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
Cisco Systems, Inc. | 2025-03-12 |
CWE ids for CVE-2025-20209
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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.Assigned by: psirt@cisco.com (Primary)
References for CVE-2025-20209
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https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
Crafting endless AS-PATHS in BGP | APNIC Blog
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https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrike-9wYGpRGq
Cisco IOS XR Software Internet Key Exchange Version 2 Denial of Service Vulnerability
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