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FKIE_CVE-2021-40118

Vulnerability from fkie_nvd - Published: 2021-10-27 19:15 - Updated: 2026-08-11 19:37
Summary
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Impacted products
Vendor Product Version
cisco adaptive_security_appliance *
cisco secure_firewall_threat_defense *
cisco secure_firewall_threat_defense *
cisco secure_firewall_threat_defense *
cisco secure_firewall_threat_defense *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco asa_5512-x_firmware 009.012\(004.024\)
cisco asa_5512-x_firmware 009.015\(001\)
cisco asa_5512-x_firmware 009.015\(001.015\)
cisco asa_5512-x_firmware 009.015\(001.016\)
cisco asa_5512-x_firmware 009.016\(001\)
cisco asa_5512-x -
cisco asa_5505_firmware 009.012\(004.024\)
cisco asa_5505_firmware 009.015\(001\)
cisco asa_5505_firmware 009.015\(001.015\)
cisco asa_5505_firmware 009.015\(001.016\)
cisco asa_5505_firmware 009.016\(001\)
cisco asa_5505 -
cisco asa_5515-x_firmware 009.012\(004.024\)
cisco asa_5515-x_firmware 009.015\(001\)
cisco asa_5515-x_firmware 009.015\(001.015\)
cisco asa_5515-x_firmware 009.015\(001.016\)
cisco asa_5515-x_firmware 009.016\(001\)
cisco asa_5515-x -
cisco asa_5525-x_firmware 009.012\(004.024\)
cisco asa_5525-x_firmware 009.015\(001\)
cisco asa_5525-x_firmware 009.015\(001.015\)
cisco asa_5525-x_firmware 009.015\(001.016\)
cisco asa_5525-x_firmware 009.016\(001\)
cisco asa_5525-x -
cisco asa_5545-x_firmware 009.012\(004.024\)
cisco asa_5545-x_firmware 009.015\(001\)
cisco asa_5545-x_firmware 009.015\(001.015\)
cisco asa_5545-x_firmware 009.015\(001.016\)
cisco asa_5545-x_firmware 009.016\(001\)
cisco asa_5545-x -
cisco asa_5555-x_firmware 009.012\(004.024\)
cisco asa_5555-x_firmware 009.015\(001\)
cisco asa_5555-x_firmware 009.015\(001.015\)
cisco asa_5555-x_firmware 009.015\(001.016\)
cisco asa_5555-x_firmware 009.016\(001\)
cisco asa_5555-x -
cisco asa_5580_firmware 009.012\(004.024\)
cisco asa_5580_firmware 009.015\(001\)
cisco asa_5580_firmware 009.015\(001.015\)
cisco asa_5580_firmware 009.015\(001.016\)
cisco asa_5580_firmware 009.016\(001\)
cisco asa_5580 -
cisco asa_5585-x_firmware 009.012\(004.024\)
cisco asa_5585-x_firmware 009.015\(001\)
cisco asa_5585-x_firmware 009.015\(001.015\)
cisco asa_5585-x_firmware 009.015\(001.016\)
cisco asa_5585-x_firmware 009.016\(001\)
cisco asa_5585-x -

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    {
      "lang": "en",
      "value": "A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la interfaz de servicios web del software Cisco Adaptive Security Appliance (ASA) y el software Cisco Firepower Threat Defense (FTD) podr\u00eda permitir a un atacante remoto no autenticado desencadenar una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a una validaci\u00f3n de entrada inadecuada al analizar las solicitudes HTTPS. Un atacante podr\u00eda explotar esta vulnerabilidad enviando una solicitud HTTPS maliciosa a un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante hacer que el dispositivo se recargue, resultando en una condici\u00f3n de DoS"
    }
  ],
  "id": "CVE-2021-40118",
  "lastModified": "2026-08-11T19:37:30.880",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.1,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-40118",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-07T21:44:22.102613Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-10-27T19:15:08.823",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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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.


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