{"id":"CVE-2025-20365","title":"Cisco Access Point Software Intermittent IPv6 Gateway Change Vulnerability (CVE-2025-20365)","summary":"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.\r\n\r\nThis vulnerability is due to a lo…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"vendor","vendor":"Cisco","product":"Cisco Aironet Access Point Software (IOS XE Controller)","affected":["aironet_access_point_software_ios_xe_controller"],"published":"2025-09-24","updated":"2025-09-26","sourceUpdated":"2025-09-26T16:35:51+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.00165,"epssPercentile":0.06147,"ingestedAt":"2026-09-08T15:58:18.538Z","slug":"CVE-2025-20365","body":"## Overview\n\nA 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.\r\n\r\nThis 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.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\n\n## Vendor advisories\n\n- **cisco-sa-ap-ipv6-gw-tUAzpn9O** · Cisco · affected: Cisco Aironet Access Point Software (IOS XE Controller) · updated 2025-09-26 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O)\n\n**Cisco Access Point Software Intermittent IPv6 Gateway Change Vulnerability**. Released 2025-09-24, updated 2025-09-26.\n\nAffected:\n\n- Cisco Aironet Access Point Software (IOS XE Controller)\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}