CVE-2025-20365: A vulnerability in the IPv6 Router Advertisement (RA) packet processing of Cisco Access Point Software could allow an unauthenticated, adjacent attacker to modify the IPv6 gateway…

Medium severity · published Sep 24, 2025

CVE-2025-20365

A vulnerability in the IPv6 Router Advertisement (RA) packet processing of Cisco Access Point Software could allow an unauthenticated, adjacent attacker to modify the IPv6 gateway…

4.3

CVSS

0.2%

EPSS

On KEV

Description

A vulnerability in the IPv6 Router Advertisement (RA) packet processing of Cisco Access Point Software could allow an unauthenticated, adjacent attacker to modify the IPv6 gateway on an affected device. This vulnerability is due to a logic error in the processing of IPv6 RA packets that are received from wireless clients. An attacker could exploit this vulnerability by associating to a wireless network and sending a series of crafted IPv6 RA packets. A successful exploit could allow the attacker to temporarily change the IPv6 gateway of an affected device. This could also lead to intermittent packet loss for any wireless clients that are associated with the affected device.

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack vector

Adjacent

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

Low

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 6% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Cisco Aironet Access Point Software (IOS XE Controller) · Cisco

16.10.1e; 16.10.1; 17.1.1t; 17.1.1s; 17.1.1; 16.11.1a; +34 more · source: vendor

Affected product

Cisco Aironet Access Point Software (IOS XE Controller)

Cisco

All Cisco Aironet Access Point Software (IOS XE Controller) CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-20365

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-20365

sec.cloudapps.cisco.com

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O

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