GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

FKIE_CVE-2021-1311

Vulnerability from fkie_nvd - Published: 2021-01-13 22:15 - Updated: 2026-06-17 03:31
Severity
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Summary
A vulnerability in the reclaim host role feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to take over the host role during a meeting. This vulnerability is due to a lack of protection against brute forcing of the host key. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Webex Meetings Server site. A successful exploit would require the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. A successful exploit could allow the attacker to acquire or take over the host role for a meeting.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVFVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVFVendor Advisory
Impacted products
Vendor Product Version
cisco webex_meetings *
cisco webex_meetings_server *
cisco webex_meetings_server 3.0
cisco webex_meetings_server 3.0
cisco webex_meetings_server 3.0
cisco webex_meetings_server 3.0
cisco webex_meetings_server 3.0
cisco webex_meetings_server 4.0
cisco webex_meetings_server 4.0
cisco webex_meetings_server 4.0
cisco webex_meetings_server 4.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco WebEx Meetings Server",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E7F9AE91-0588-4752-A061-E66378DDD1C8",
              "versionEndExcluding": "40.12.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DE22BE9B-374E-43DC-BA91-E3B9699A4C7C",
              "versionEndExcluding": "3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:3.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "61D1081F-87E8-4E8B-BEBD-0F239E745586",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release1:*:*:*:*:*:*",
              "matchCriteriaId": "8D138973-02B0-4FEC-A646-FF1278DA1EDF",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release2:*:*:*:*:*:*",
              "matchCriteriaId": "30B55A5B-8C5E-4ECB-9C85-A8A3A3030850",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release3:*:*:*:*:*:*",
              "matchCriteriaId": "14DBEC10-0641-441C-BE15-8F72C1762DCE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:3.0:maintenance_release4:*:*:*:*:*:*",
              "matchCriteriaId": "4646849B-8190-4798-833C-F367E28C1881",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:4.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "4D6CF856-093A-4E89-A71D-50A2887C265B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release1:*:*:*:*:*:*",
              "matchCriteriaId": "B36A9043-0621-43CD-BFCD-66529F937859",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release2:*:*:*:*:*:*",
              "matchCriteriaId": "8842B42E-C412-4356-9F54-DFC53B683D3E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:cisco:webex_meetings_server:4.0:maintenance_release3:*:*:*:*:*:*",
              "matchCriteriaId": "D25BC647-C569-46E5-AD45-7E315EBEB784",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the reclaim host role feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to take over the host role during a meeting. This vulnerability is due to a lack of protection against brute forcing of the host key. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Webex Meetings Server site. A successful exploit would require the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. A successful exploit could allow the attacker to acquire or take over the host role for a meeting."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la funcionalidad reclaim host role de host de Cisco Webex Meetings y Cisco Webex Meetings Server, podr\u00eda permitir a un atacante remoto autenticado se haga cargo de la funci\u00f3n de host durante una reuni\u00f3n.\u0026#xa0;Esta vulnerabilidad se debe a la falta de protecci\u00f3n contra la fuerza bruta de la clave del host.\u0026#xa0;Un atacante podr\u00eda explotar esta vulnerabilidad enviando solicitudes dise\u00f1adas a un sitio vulnerable de Cisco Webex Meetings o Webex Meetings Server.\u0026#xa0;Una explotaci\u00f3n con \u00e9xito requerir\u00eda que el atacante tuviera acceso para unirse a una reuni\u00f3n de Webex, incluidos los v\u00ednculos y las contrase\u00f1as correspondientes para unirse a la reuni\u00f3n.\u0026#xa0;Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante adquirir o asumir el rol de anfitri\u00f3n de una reuni\u00f3n."
    }
  ],
  "id": "CVE-2021-1311",
  "lastModified": "2026-06-17T03:31:28.093",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.5,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-1311",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-08T20:52:54.578387Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-01-13T22:15:21.630",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVF"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVF"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-307"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-307"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.