CVE-2021-1312

{
  "id": "CVE-2021-1312",
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          "id": "CVE-2021-1312",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2024-11-08T20:05:01.413003Z"
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
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        "exploitabilityScore": 10,
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
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        "impactScore": 1.4,
        "exploitabilityScore": 3.9
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "Cisco",
          "product": "Cisco Elastic Services Controller",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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  "published": "2021-01-20T20:15:17.283",
  "references": [
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esc-dos-4Gw6D527",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
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    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esc-dos-4Gw6D527",
      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the system resource management of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) to the health monitor API on an affected device. The vulnerability is due to inadequate provisioning of kernel parameters for the maximum number of TCP connections and SYN backlog. An attacker could exploit this vulnerability by sending a flood of crafted TCP packets to an affected device. A successful exploit could allow the attacker to block TCP listening ports that are used by the health monitor API. This vulnerability only affects customers who use the health monitor API."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la administración de recursos del sistema de Cisco Elastic Services Controller (ESC), podría permitir a un atacante no autenticado remoto causar una denegación de servicio (DoS) a la API del monitor de salud en un dispositivo afectado. La vulnerabilidad es debido al aprovisionamiento inadecuado de los parámetros del kernel para el número máximo de conexiones TCP y atrasos de SYN. Un atacante podría explotar esta vulnerabilidad mediante el envío de una avalancha de paquetes TCP diseñados hacia un dispositivo afectado. Una explotación con éxito podría permitir al atacante bloquear los puertos de escucha TCP que usa la API del monitor de salud. Esta vulnerabilidad solo afecta a los clientes que usan la API del monitor de salud"
    }
  ],
  "lastModified": "2026-06-17T03:31:28.223",
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  "sourceIdentifier": "psirt@cisco.com"
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