fkie_cve-2025-20127
Vulnerability from fkie_nvd
Published
2025-08-14 17:15
Modified
2025-08-25 14:35
Severity ?
7.7 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Summary
A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the device to stop accepting any new SSL/TLS or VPN requests. This vulnerability is due to the implementation of the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. An attacker could exploit this vulnerability by sending a large number of TLS 1.3 connections with the specific TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. A successful exploit could allow the attacker to cause a denial of service (DoS) condition where no new incoming encrypted connections are accepted. The device must be reloaded to clear this condition. Note: These incoming TLS 1.3 connections include both data traffic and user-management traffic. After the device is in the vulnerable state, no new encrypted connections can be accepted.
References
psirt@cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3100_4200_tlsdos-2yNSCd54Vendor Advisory
Impacted products
Vendor Product Version
cisco firepower_threat_defense 7.4.0
cisco firepower_threat_defense 7.4.1
cisco firepower_threat_defense 7.4.1.1
cisco firepower_threat_defense 7.4.2
cisco firepower_threat_defense 7.4.2.1
cisco firepower_threat_defense 7.6.0
cisco secure_firewall_3105 -
cisco secure_firewall_3110 -
cisco secure_firewall_3120 -
cisco secure_firewall_3130 -
cisco secure_firewall_3140 -
cisco secure_firewall_4215 -
cisco secure_firewall_4225 -
cisco secure_firewall_4245 -
cisco adaptive_security_appliance_software 9.20.1
cisco adaptive_security_appliance_software 9.20.1.5
cisco adaptive_security_appliance_software 9.20.2
cisco adaptive_security_appliance_software 9.20.2.10
cisco adaptive_security_appliance_software 9.20.2.21
cisco adaptive_security_appliance_software 9.20.2.22
cisco adaptive_security_appliance_software 9.20.3
cisco adaptive_security_appliance_software 9.20.3.4
cisco adaptive_security_appliance_software 9.20.3.7
cisco adaptive_security_appliance_software 9.22.1.1
cisco secure_firewall_3105 -
cisco secure_firewall_3110 -
cisco secure_firewall_3120 -
cisco secure_firewall_3130 -
cisco secure_firewall_3140 -
cisco secure_firewall_4215 -
cisco secure_firewall_4225 -
cisco secure_firewall_4245 -


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the device to stop accepting any new SSL/TLS or VPN requests.\r\n\r\nThis vulnerability is due to the implementation of the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. An attacker could exploit this vulnerability by sending a large number of TLS 1.3 connections with the specific TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. A successful exploit could allow the attacker to cause a denial of service (DoS) condition where no new incoming encrypted connections are accepted. The device must be reloaded to clear this condition.\r\nNote: These incoming TLS 1.3 connections include both data traffic and user-management traffic. After the device is in the vulnerable state, no new encrypted connections can be accepted."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la implementaci\u00f3n de TLS 1.3 para un cifrado espec\u00edfico del software Cisco Secure Firewall Adaptive Security Appliance (ASA) y del software Cisco Secure Firewall Threat Defense (FTD) para dispositivos Cisco Firepower de las series 3100 y 4200 podr\u00eda permitir que un atacante remoto autenticado consuma recursos asociados con conexiones entrantes TLS 1.3, lo que eventualmente podr\u00eda provocar que el dispositivo deje de aceptar nuevas solicitudes SSL/TLS o VPN. Esta vulnerabilidad se debe a la implementaci\u00f3n del cifrado TLS_CHACHA20_POLY1305_SHA256 de TLS 1.3. Un atacante podr\u00eda explotar esta vulnerabilidad enviando un gran n\u00famero de conexiones TLS 1.3 con el cifrado TLS_CHACHA20_POLY1305_SHA256. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante causar una denegaci\u00f3n de servicio (DoS) donde no se aceptan nuevas conexiones cifradas entrantes. El dispositivo debe reiniciarse para solucionar esta situaci\u00f3n. Nota: Estas conexiones entrantes TLS 1.3 incluyen tanto tr\u00e1fico de datos como de administraci\u00f3n de usuarios. Una vez que el dispositivo se encuentra en estado vulnerable, no se pueden aceptar nuevas conexiones cifradas."
    }
  ],
  "id": "CVE-2025-20127",
  "lastModified": "2025-08-25T14:35:24.387",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.0,
        "source": "psirt@cisco.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-08-14T17:15:33.907",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3100_4200_tlsdos-2yNSCd54"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-404"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Primary"
    }
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}


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