cve-2026-20349

{
  "cvss": 8.6,
  "datePublished": "2026-08-11T17:17:48.833",
  "dateUpdated": "2026-10-26T13:10:00.140",
  "description": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. \r\n\r\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.",
  "id": "CVE-2026-20349",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unknown",
            "product": "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software",
            "vendor": "Cisco",
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              {
                "status": "affected",
                "version": "9.16.1"
              },
              {
                "status": "affected",
                "version": "9.16.1.28"
              },
              {
                "status": "affected",
                "version": "9.16.2"
              },
              {
                "status": "affected",
                "version": "9.16.2.3"
              },
              {
                "status": "affected",
                "version": "9.16.2.7"
              },
              {
                "status": "affected",
                "version": "9.16.2.11"
              },
              {
                "status": "affected",
                "version": "9.16.2.13"
              },
              {
                "status": "affected",
                "version": "9.16.2.14"
              },
              {
                "status": "affected",
                "version": "9.16.3.3"
              },
              {
                "status": "affected",
                "version": "9.16.3"
              },
              {
                "status": "affected",
                "version": "9.16.3.14"
              },
              {
                "status": "affected",
                "version": "9.18.1"
              },
              {
                "status": "affected",
                "version": "9.16.3.15"
              },
              {
                "status": "affected",
                "version": "9.18.1.3"
              },
              {
                "status": "affected",
                "version": "9.18.2"
              },
              {
                "status": "affected",
                "version": "9.16.3.19"
              },
              {
                "status": "affected",
                "version": "9.16.3.23"
              },
              {
                "status": "affected",
                "version": "9.18.2.5"
              },
              {
                "status": "affected",
                "version": "9.16.4"
              },
              {
                "status": "affected",
                "version": "9.18.2.7"
              },
              {
                "status": "affected",
                "version": "9.19.1"
              },
              {
                "status": "affected",
                "version": "9.16.4.9"
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                "version": "9.18.2.8"
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                "version": "9.18.3"
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                "version": "9.19.1.5"
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                "version": "9.16.4.18"
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                "version": "9.20.1"
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          {
            "defaultStatus": "unknown",
            "product": "Cisco Secure Firewall Threat Defense (FTD) Software",
            "vendor": "Cisco",
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                "status": "affected",
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              },
              {
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                "version": "7.4.2.3"
              },
              {
                "status": "affected",
                "version": "7.0.8"
              },
              {
                "status": "affected",
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              },
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                "status": "affected",
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              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
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                "status": "affected",
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                "status": "affected",
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              {
                "status": "affected",
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                "status": "affected",
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              {
                "status": "affected",
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              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
                "version": "10.0.0"
              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
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              },
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                "status": "affected",
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              },
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                "status": "affected",
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              },
              {
                "status": "affected",
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            ]
          }
        ],
        "source": "psirt@cisco.com"
      }
    ],
    "cisaActionDue": "2026-08-14",
    "cisaExploitAdd": "2026-08-11",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability",
    "configurations": [
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    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. \r\n\r\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition."
      },
      {
        "lang": "es",
        "value": "Una vulnerabilidad en el servicio VPN SSL de Acceso Remoto para el software Cisco Secure Firewall Adaptive Security Appliance (ASA) y el software Cisco Secure Firewall Threat Defense (FTD) podría permitir a un atacante remoto no autenticado causar que el dispositivo se reinicie inesperadamente, lo que resultaría en una condición de denegación de servicio (DoS).\n\nEsta vulnerabilidad se debe a una comprobación de errores insuficiente al procesar solicitudes HTTP. Un atacante podría explotar esta vulnerabilidad enviando una solicitud HTTP manipulada al servicio VPN SSL de Acceso Remoto en un dispositivo afectado. Un exploit exitoso podría permitir al atacante causar que el dispositivo afectado se reinicie, lo que resultaría en una condición de DoS."
      }
    ],
    "id": "CVE-2026-20349",
    "lastModified": "2026-10-26T13:10:00.140",
    "metrics": {
      "cvssMetricV31": [
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          "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"
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          "exploitabilityScore": 3.9,
          "impactScore": 4.0,
          "source": "psirt@cisco.com",
          "type": "Secondary"
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                "technicalImpact": "partial"
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            "role": "CISA Coordinator",
            "timestamp": "2026-08-11T00:00:00+00:00",
            "version": "2.0.3"
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    "published": "2026-08-11T17:17:48.833",
    "references": [
      {
        "source": "psirt@cisco.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF"
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        "tags": [
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    "vulnStatus": "Analyzed",
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            "value": "CWE-244"
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        "source": "psirt@cisco.com",
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  },
  "severity": "HIGH",
  "source": "nvd",
  "title": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Soft..."
}