FKIE_CVE-2022-20737

Vulnerability from fkie_nvd - Published: 2022-05-03 04:15 - Updated: 2026-06-17 04:24
Severity
8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Summary
A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. An attacker could exploit this vulnerability by sending malicious traffic to an affected device acting as a VPN Gateway. To send this malicious traffic, an attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-heap-zLX3FdXVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-heap-zLX3FdXVendor Advisory
Impacted products
Vendor Product Version
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
cisco adaptive_security_appliance_software *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco Adaptive Security Appliance (ASA) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
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  "cveTags": [],
  "descriptions": [
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      "value": "A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. An attacker could exploit this vulnerability by sending malicious traffic to an affected device acting as a VPN Gateway. To send this malicious traffic, an attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el administrador de la autenticaci\u00f3n HTTP para los recursos a los que se accede a trav\u00e9s del portal Clientless SSL VPN del software Cisco Adaptive Security Appliance (ASA) podr\u00eda permitir a un atacante remoto autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado u obtuviera partes de la memoria del proceso de un dispositivo afectado. Esta vulnerabilidad es debido a una comprobaci\u00f3n insuficiente de los l\u00edmites cuando son analizados determinados mensajes de autenticaci\u00f3n HTTP. Un atacante podr\u00eda explotar esta vulnerabilidad  mediante el env\u00edo de tr\u00e1fico malicioso a un dispositivo afectado que act\u00fae como puerta de enlace VPN. Para enviar este tr\u00e1fico malicioso, un atacante necesitar\u00eda controlar un servidor web al que pueda accederse mediante el portal Clientless SSL VPN. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar la recarga del dispositivo, resultando en una condici\u00f3n DoS, o recuperar bytes de la memoria de proceso del dispositivo que podr\u00edan contener informaci\u00f3n confidencial"
    }
  ],
  "id": "CVE-2022-20737",
  "lastModified": "2026-06-17T04:24:58.977",
  "metrics": {
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        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:S/C:P/I:N/A:C",
          "version": "2.0"
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        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
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          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H",
          "version": "3.1"
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        "impactScore": 4.7,
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        "type": "Secondary"
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          "confidentialityImpact": "LOW",
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          "scope": "UNCHANGED",
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-20737",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-06T15:58:40.087126Z",
          "version": "2.0.3"
        }
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  },
  "published": "2022-05-03T04:15:09.183",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
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  "vulnStatus": "Modified",
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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