What is the severity of CVE-2025-20221?

CVE-2025-20221 has been classified with a medium severity level, indicating it poses a moderate risk to affected systems.

How do I fix CVE-2025-20221?

To mitigate CVE-2025-20221, users should apply the relevant Cisco IOS XE SD-WAN software updates as recommended by Cisco.

What systems are affected by CVE-2025-20221?

CVE-2025-20221 affects Cisco IOS XE SD-WAN Software deployments that utilize vulnerable packet filtering features.

Can CVE-2025-20221 be exploited remotely?

Yes, CVE-2025-20221 can be exploited by unauthenticated remote attackers to bypass Layer 3 and Layer 4 traffic filters.

What causes CVE-2025-20221?

CVE-2025-20221 is caused by improper traffic filtering conditions on affected devices within the Cisco IOS XE SD-WAN Software.

Vulnerability/
CVE-2025-20221

medium

5.3

CWE

200

7/5/2025

8/5/2025

CVE-2025-20221: Infoleak

First published: Wed May 07 2025(Updated: )

A vulnerability in the packet filtering features of Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to bypass Layer 3 and Layer 4 traffic filters. This vulnerability is due to improper traffic filtering conditions on an affected device. An attacker could exploit this vulnerability by sending a crafted packet to the affected device. A successful exploit could allow the attacker to bypass the Layer 3 and Layer 4 traffic filters and inject a crafted packet into the network.

Credit: psirt@cisco.com

Affected Software	Affected Version	How to fix
Cisco Standalone IOS XE SD-WAN Releases

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-bypass-HHUVujdn

Frequently Asked Questions

What is the severity of CVE-2025-20221?
CVE-2025-20221 has been classified with a medium severity level, indicating it poses a moderate risk to affected systems.
How do I fix CVE-2025-20221?
To mitigate CVE-2025-20221, users should apply the relevant Cisco IOS XE SD-WAN software updates as recommended by Cisco.
What systems are affected by CVE-2025-20221?
CVE-2025-20221 affects Cisco IOS XE SD-WAN Software deployments that utilize vulnerable packet filtering features.
Can CVE-2025-20221 be exploited remotely?
Yes, CVE-2025-20221 can be exploited by unauthenticated remote attackers to bypass Layer 3 and Layer 4 traffic filters.
What causes CVE-2025-20221?
CVE-2025-20221 is caused by improper traffic filtering conditions on affected devices within the Cisco IOS XE SD-WAN Software.

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