CVE-2024-20501 (GCVE-0-2024-20501)
Vulnerability from cvelistv5
Published
2024-10-02 18:23
Modified
2025-06-04 20:19
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
Summary
Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device. These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
References
Impacted products
Vendor Product Version
Cisco Cisco Meraki MX Firmware Affected: N/A
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device.\\r\\n\\r\\nThese vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.\\r\\nNote: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.\"}, {\"lang\": \"es\", \"value\": \"Varias vulnerabilidades en el servidor VPN de Cisco AnyConnect de los dispositivos Cisco Meraki MX y Cisco Meraki Z Series Teleworker Gateway podr\\u00edan permitir que un atacante remoto no autenticado provoque una condici\\u00f3n de denegaci\\u00f3n de servicio (DoS) en el servicio AnyConnect de un dispositivo afectado. Estas vulnerabilidades se deben a una validaci\\u00f3n insuficiente de los par\\u00e1metros proporcionados por el cliente al establecer una sesi\\u00f3n VPN SSL. Un atacante podr\\u00eda aprovechar estas vulnerabilidades enviando una solicitud HTTPS manipulada al servidor VPN de un dispositivo afectado. Una explotaci\\u00f3n exitosa podr\\u00eda permitir que el atacante haga que el servidor VPN de Cisco AnyConnect se reinicie, lo que provocar\\u00eda la falla de las conexiones VPN SSL establecidas y obligar\\u00eda a los usuarios remotos a iniciar una nueva conexi\\u00f3n VPN y volver a autenticarse. Un ataque sostenido podr\\u00eda evitar que se establezcan nuevas conexiones VPN SSL. Nota: Cuando el tr\\u00e1fico del ataque se detiene, el servidor VPN de Cisco AnyConnect se recupera sin problemas sin necesidad de intervenci\\u00f3n manual.\"}]",
      "id": "CVE-2024-20501",
      "lastModified": "2024-10-08T18:28:51.753",
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      "published": "2024-10-02T19:15:14.570",
      "references": "[{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2\", \"source\": \"ykramarz@cisco.com\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "ykramarz@cisco.com",
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-20501\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-02T19:01:58.939883Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:h:cisco:meraki_mx:-:*:*:*:*:*:*:*\"], \"vendor\": \"cisco\", \"product\": \"meraki_mx\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:h:cisco:meraki_z1:-:*:*:*:*:*:*:*\"], \"vendor\": \"cisco\", \"product\": \"meraki_z1\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-02T19:02:56.216Z\"}}], \"cna\": {\"source\": {\"advisory\": \"cisco-sa-meraki-mx-vpn-dos-QTRHzG2\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 8.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Meraki MX Firmware\", \"versions\": [{\"status\": \"affected\", \"version\": \"N/A\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Neither the Cisco Product Security Incident Response Team (PSIRT) nor the Cisco Meraki Incident Response Team is aware of any malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2\", \"name\": \"cisco-sa-meraki-mx-vpn-dos-QTRHzG2\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition in the AnyConnect service on an affected device.\\r\\n\\n These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.\\r\\n\\n Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-787\", \"description\": \"Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2025-06-04T20:19:33.645Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-20501\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-04T20:19:33.645Z\", \"dateReserved\": \"2023-11-08T15:08:07.687Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2024-10-02T18:23:35.875Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.