CVE-2024-20500 (GCVE-0-2024-20500)

Vulnerability from cvelistv5 – Published: 2024-10-02 18:23 – Updated: 2025-06-04 20:19
VLAI?
Summary
A vulnerability 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. This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
Impacted products
Show details on NVD website

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"A vulnerability 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\\nThis vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.\\r\\nNote: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.\"}, {\"lang\": \"es\", \"value\": \"Una vulnerabilidad en el servidor VPN de Cisco AnyConnect de los dispositivos Cisco Meraki MX y Cisco Meraki Z Series Teleworker Gateway podr\\u00eda 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. Esta vulnerabilidad se debe a una gesti\\u00f3n insuficiente de los recursos al establecer sesiones TLS/SSL. Un atacante podr\\u00eda aprovechar esta vulnerabilidad enviando una serie de mensajes TLS/SSL manipulados al servidor VPN de un dispositivo afectado. Una explotaci\\u00f3n exitosa podr\\u00eda permitir al atacante hacer que el servidor VPN de Cisco AnyConnect deje de aceptar nuevas conexiones, lo que impedir\\u00eda que se establecieran nuevas conexiones VPN SSL. Las sesiones VPN SSL existentes no se ven afectadas. 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-2024-20500",
      "lastModified": "2024-10-08T18:27:19.347",
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      "published": "2024-10-02T19:15:14.350",
      "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",
      "vulnStatus": "Analyzed",
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-20500\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-02T19:05:10.593025Z\"}}}], \"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\": \"2024-10-02T19:05:47.268Z\"}}], \"cna\": {\"source\": {\"advisory\": \"cisco-sa-meraki-mx-vpn-dos-QTRHzG2\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 5.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"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\": \"A vulnerability 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 This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.\\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-400\", \"description\": \"Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2025-06-04T20:19:21.359Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-20500\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-04T20:19:21.359Z\", \"dateReserved\": \"2023-11-08T15:08:07.687Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2024-10-02T18:23:19.259Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.


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Detection rules are retrieved from Rulezet.

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