{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco Technical Assistance Center (TAC) support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "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 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.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, these vulnerabilities affected the following Cisco products if they were running a vulnerable release of Cisco Access Point Software and were configured for Control and Provisioning of Wireless Access Points (CAPWAP) over IPv6:\r\n\r\n6300 Series Embedded Services Access Points (APs)\r\nAironet 1540 Series APs\r\nAironet 1560 Series APs\r\nAironet 1800 Series APs\r\nAironet 2800 Series APs\r\nAironet 3800 Series APs\r\nAironet 4800 APs\r\nCatalyst 9100 APs\r\nCatalyst IW6300 Heavy Duty Series APs\r\nIntegrated APs on1100 Integrated Services Routers (ISRs)\r\n\r\nFor information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software [\"#fs\"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nDetermine the AP configuration\r\n\r\nTo determine whether the APs are configured for CAPWAP over IPv6, log in to the device CLI and use the show ap summary command. This will display the APs that are managed by the wireless LAN controller (WLC), along with information that includes the IP address that the device uses for CAPWAP. If any AP shows an IPv6 address, the device is affected by this vulnerability.\r\n\r\nThe following example shows the output of the show ap summary command issued on a Cisco Catalyst 9800 Series Wireless Controller that is managing two APs:\r\n        WLC#sh ap summary\r\nNumber of APs: 2\r\n\r\n      CC = Country Code      RD = Regulatory Domain      AP Name    Slots    AP Model    Ethernet MAC        Radio MAC            CC     RD   IP Address        State             Location      ap1             3        CW9172H     8c88.8111.2244    8c88.8111.2240    GB   -E    192.168.0.115   Registered   default location      ap2             3        CW9172H     8c88.8111.2233    8c88.8111.2230    GB   -E    2100:::::1755     Registered   default location\r\nIn the preceding example, the AP ap2 is using an IPv6 address. Therefore, the device is affected by this vulnerability.",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect any Cisco Access Point series that is not listed in the Vulnerable Products [\"#vp\"] section of this advisory.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco considers any workarounds and mitigations to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.\r\n      Fixed Releases\r\nAt the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nThe left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability that is described in this advisory and which release included the fix for this vulnerability.\r\n\r\nThe process to upgrade an access point (AP) requires administrators to upgrade the wireless controller to which the AP is registered. Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table:\r\n\r\nAccess Points Managed by Catalyst 9800 Wireless Controller or Embedded Wireless Controller (EWC)\r\n        Cisco WLC IOS XE Software  First Fixed Release          17.8 and earlier  Migrate to a fixed release.      17.9  17.9.7      17.10  Migrate to a fixed release.       17.11  Migrate to a fixed release.      17.12  17.12.5      17.13  Migrate to a fixed release.      17.14  Migrate to a fixed release.      17.15  17.15.2      17.16  Not vulnerable.      17.17  Not vulnerable.      17.18  Not vulnerable.\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.\r\n\r\nAccess Points Managed by Wireless LAN Controller or Mobility Express (ME)\r\n\r\nCisco WLC 3504, 5520, 8540, Mobility Express (ME) and Virtual WLC are past their respective dates for End of Software Maintenance Releases. For this reason, Cisco has not released and will not release software updates to address the vulnerabilities that are described in this advisory. Customers are advised to refer to the end-of-life notices for these products:\r\n\r\nEnd-of-Life Announcement for the Cisco Wireless Software Version 8.10 [\"https://www.cisco.com/c/en/us/products/collateral/wireless/8500-series-wireless-controllers/wireless-software-8-10-pb.html\"]\r\nEnd-of-Life Announcement for 3504 Wireless Controller [\"https://www.cisco.com/c/en/us/products/collateral/wireless/3504-wireless-controller/eos-eol-notice-c51-744737.html\"]\r\nEnd-of-Life Announcement for 5520 Wireless Controller [\"https://www.cisco.com/c/en/us/products/collateral/wireless/5520-wireless-controller/eos-eol-notice-c51-744430.html\"]\r\nEnd-of-Life Announcement for 8540 Wireless Controller [\"https://www.cisco.com/c/en/us/products/collateral/wireless/8540-wireless-controller/eos-eol-notice-c51-744431.html\"]\r\nEnd-of-Life Announcement for Virtual Wireless Controller [\"https://www.cisco.com/c/en/us/products/collateral/wireless/virtual-wireless-controller/eos-eol-notice-c51-744428.html\"]\r\n\r\nWhen considering a device migration, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.\r\n\r\nIn all cases, customers should ensure that any new products will be sufficient for their network needs, that the new devices contain sufficient memory, and that current hardware and software configurations will continue to be supported properly by the new product. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found during the resolution of a Cisco Technical Assistance Center (TAC) support case.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT\r\n\r\nThe Cisco Support and Downloads [\"https://www.cisco.com/c/en/us/support/index.html\"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.\r\n\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories [\"https://www.cisco.com/go/psirt\"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"] or their contracted maintenance providers.\r\n    LEGAL DISCLAIMER DETAILS\r\n\r\nCISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nCopies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories [\"https://www.cisco.com/go/psirt\"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] for more information.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Access Point Software Intermittent IPv6 Gateway Change Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "End-of-Life Announcement for the Cisco Wireless Software Version 8.10",
        "url": "https://www.cisco.com/c/en/us/products/collateral/wireless/8500-series-wireless-controllers/wireless-software-8-10-pb.html"
      },
      {
        "category": "external",
        "summary": "End-of-Life Announcement for 3504 Wireless Controller",
        "url": "https://www.cisco.com/c/en/us/products/collateral/wireless/3504-wireless-controller/eos-eol-notice-c51-744737.html"
      },
      {
        "category": "external",
        "summary": "End-of-Life Announcement for 5520 Wireless Controller",
        "url": "https://www.cisco.com/c/en/us/products/collateral/wireless/5520-wireless-controller/eos-eol-notice-c51-744430.html"
      },
      {
        "category": "external",
        "summary": "End-of-Life Announcement for 8540 Wireless Controller",
        "url": "https://www.cisco.com/c/en/us/products/collateral/wireless/8540-wireless-controller/eos-eol-notice-c51-744431.html"
      },
      {
        "category": "external",
        "summary": "End-of-Life Announcement for Virtual Wireless Controller",
        "url": "https://www.cisco.com/c/en/us/products/collateral/wireless/virtual-wireless-controller/eos-eol-notice-c51-744428.html"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Cisco Support and Downloads",
        "url": "https://www.cisco.com/c/en/us/support/index.html"
      },
      {
        "category": "external",
        "summary": "Cisco Technical Assistance Center (TAC)",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "the advisories",
        "url": "https://www.cisco.com/go/psirt"
      }
    ],
    "title": "Cisco Access Point Software Intermittent IPv6 Gateway Change Vulnerability",
    "tracking": {
      "current_release_date": "2025-09-26T16:35:51+00:00",
      "generator": {
        "date": "2025-09-26T16:36:11+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-ap-ipv6-gw-tUAzpn9O",
      "initial_release_date": "2025-09-24T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2025-09-24T15:58:34+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2025-09-26T16:35:51+00:00",
          "number": "1.1.0",
          "summary": "Updated the conditions that are necessary for a product to be affected."
        }
      ],
      "status": "final",
      "version": "1.1.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco Aironet Access Point Software (IOS XE Controller)",
            "product": {
              "name": "Cisco Aironet Access Point Software (IOS XE Controller) ",
              "product_id": "CSAFPID-280019"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-20365",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwm13005"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-280019"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-280019"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-280019"
          ]
        }
      ],
      "title": "Cisco Access Point Software Intermittent IPv6 Gateway Change Vulnerability"
    }
  ]
}

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 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."
    }
  ],
  "id": "CVE-2025-20365",
  "lastModified": "2025-09-24T18:15:37.310",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-09-24T17:15:40.880",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-940"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2025-20365"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-940"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-24T17:15:40Z",
    "severity": "MODERATE"
  },
  "details": "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.\n\n 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.",
  "id": "GHSA-g88p-ppwj-3qff",
  "modified": "2025-09-24T18:30:31Z",
  "published": "2025-09-24T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-20365"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ipv6-gw-tUAzpn9O"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}