{
  "affected": [],
  "aliases": [
    "CVE-2025-20215"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-06T17:15:37Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in the meeting-join functionality of Cisco Webex Meetings could have allowed an unauthenticated, network-proximate attacker to complete a meeting-join process in place of an intended targeted user, provided the requisite conditions were satisfied. Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed.\n\nThis vulnerability existed due to client certificate validation issues. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by monitoring local wireless or adjacent networks for client-join requests and attempting to interrupt and complete the meeting-join flow as another user who was currently joining a meeting. To successfully exploit the vulnerability, an attacker would need the capability to position themselves in a local wireless or adjacent network, to monitor and intercept the targeted network traffic flows, and to satisfy timing requirements in order to interrupt the meeting-join flow and exploit the vulnerability. A successful exploit could have allowed the attacker to join the meeting as another user. However, the Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.",
  "id": "GHSA-7pj3-g359-9mw7",
  "modified": "2025-08-06T18:31:21Z",
  "published": "2025-08-06T18:31:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-20215"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-join-yNXfqHk4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the meeting-join functionality of Cisco Webex Meetings could have allowed an unauthenticated, network-proximate attacker to complete a meeting-join process in place of an intended targeted user, provided the requisite conditions were satisfied. Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed.\r\n\r\nThis vulnerability existed due to client certificate validation issues. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by monitoring local wireless or adjacent networks for client-join requests and attempting to interrupt and complete the meeting-join flow as another user who was currently joining a meeting. To successfully exploit the vulnerability, an attacker would need the capability to position themselves in a local wireless or adjacent network, to monitor and intercept the targeted network traffic flows, and to satisfy timing requirements in order to interrupt the meeting-join flow and exploit the vulnerability. A successful exploit could have allowed the attacker to join the meeting as another user. However, the Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la funci\u00f3n \"meeting-join\" de Cisco Webex Meetings podr\u00eda haber permitido que un atacante no autenticado, cercano a la red, completara el \"meeting-join\"  en lugar del usuario objetivo, siempre que se cumplieran las condiciones requeridas. Cisco ha solucionado esta vulnerabilidad en el servicio Cisco Webex Meetings y no se requiere ninguna acci\u00f3n por parte del cliente. Esta vulnerabilidad exist\u00eda debido a problemas de validaci\u00f3n del certificado del cliente. Antes de que se solucionara, un atacante podr\u00eda haberla explotado monitorizando redes inal\u00e1mbricas locales o adyacentes en busca de solicitudes de uni\u00f3n de clientes e intentando interrumpir y completar el flujo de entrada a la reuni\u00f3n como otro usuario que se estaba uniendo a una reuni\u00f3n. Para explotar la vulnerabilidad con \u00e9xito, un atacante necesitar\u00eda la capacidad de posicionarse en una red inal\u00e1mbrica local o adyacente, monitorizar e interceptar los flujos de tr\u00e1fico de la red objetivo y cumplir con los requisitos de tiempo para interrumpir el flujo de entrada a la reuni\u00f3n y explotar la vulnerabilidad. Una explotaci\u00f3n exitosa podr\u00eda haber permitido al atacante unirse a la reuni\u00f3n como otro usuario. Sin embargo, el Equipo de Respuesta a Incidentes de Seguridad de Productos de Cisco (PSIRT) no tiene conocimiento de ning\u00fan uso malicioso de la vulnerabilidad descrita en este aviso."
    }
  ],
  "id": "CVE-2025-20215",
  "lastModified": "2025-08-06T20:23:37.600",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 4.2,
        "source": "psirt@cisco.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-08-06T17:15:37.033",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-join-yNXfqHk4"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Primary"
    }
  ]
}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank the following people for reporting this vulnerability:\r\n\r\nMartin Bach of Technical University of Darmstadt (TU Darmstadt) and Technology Innovation Institute (TII)\r\nVuka\u0161in Karad\u017eic of TU Darmstadt\r\nLukas Knittel of Ruhr University Bochum\r\nRobert Merget of TII\r\nJean Paul Degabriele of TII"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the meeting-join functionality of Cisco Webex Meetings could have allowed an unauthenticated, network-proximate attacker to complete a meeting-join process in place of an intended targeted user, provided the requisite conditions were satisfied. Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed.\r\n\r\nThis vulnerability existed due to client certificate validation issues. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by monitoring local wireless or adjacent networks for client-join requests and attempting to interrupt and complete the meeting-join flow as another user who was currently joining a meeting. To successfully exploit the vulnerability, an attacker would need the capability to position themselves in a local wireless or adjacent network, to monitor and intercept the targeted network traffic flows, and to satisfy timing requirements in order to interrupt the meeting-join flow and exploit the vulnerability. A successful exploit could have allowed the attacker to join the meeting as another user. However, the Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.\r\n\r\nAs mentioned, Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is necessary to update on-premises software or devices. There are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affected Cisco Webex Meetings, which is cloud based.",
        "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.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has addressed this vulnerability in Cisco Webex Meetings, which is cloud based. No user action is required.\r\n\r\nCustomers who need additional information 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": "Cisco would like to thank the following people for reporting this vulnerability:\r\n\r\nMartin Bach of Technical University of Darmstadt (TU Darmstadt) and Technology Innovation Institute (TII)\r\nVuka\u0161in Karad\u017eic of TU Darmstadt\r\nLukas Knittel of Ruhr University Bochum\r\nRobert Merget of TII\r\nJean Paul Degabriele of TII",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. 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\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
        "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 Webex Meeting Client Join Certificate Validation Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-join-yNXfqHk4"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Webex Meeting Client Join Certificate Validation Vulnerability",
    "tracking": {
      "current_release_date": "2025-08-06T16:00:00+00:00",
      "generator": {
        "date": "2025-08-06T15:56:45+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-webex-join-yNXfqHk4",
      "initial_release_date": "2025-08-06T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2025-08-06T15:56:39+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco Webex Meetings",
            "product": {
              "name": "Cisco Webex Meetings ",
              "product_id": "CSAFPID-228295"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-20215",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwn62160"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-228295"
        ]
      },
      "release_date": "2025-08-06T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-228295"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-228295"
          ]
        }
      ],
      "title": "Cisco Webex Meeting Client Join Certificate Validation Vulnerability"
    }
  ]
}