Cisco ASA and PIX SSL VPN denial of service

cisco-asa-ssl-vpn-dos (34023) The risk level is classified as MediumMedium Risk


Cisco Adaptive Security Appliance (ASA) and PIX security appliances are vulnerable to a denial of service caused by a race condition in the SSL VPN HTTP server. A remote attacker could exploit this vulnerability to cause the device to reload and drop all existing connections, resulting in a denial of service.


Base Score: 5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Denial of Service


Refer to cisco-sa-20070502-asa for upgrade information. See References.


  • cisco-sa-20070502-asa: Cisco Security Advisory: LDAP and VPN Vulnerabilities in PIX and ASA Appliances.
  • BID-23768: Cisco PIX And ASA Appliances Multiple Remote Vulnerabilities
  • CVE-2007-2464: Race condition in Cisco Adaptive Security Appliance (ASA) and PIX 7.1 before 7.1(2)49 and 7.2 before 7.2(2)19, when using clientless SSL VPNs
  • OSVDB ID: 35333: Cisco PIX / ASA Crafted Clientless SSL Connection Race Condition DoS
  • SA25109: Cisco PIX and ASA Denial of Service and Security Bypass
  • US-CERT VU#337508: Cisco ASA clientless SSL VPN denial of service vulnerability

Platforms Affected:

  • Cisco Adaptive Security Appliance 7.0(2)
  • Cisco Adaptive Security Appliance 7.1
  • Cisco Adaptive Security Appliance 7.2
  • Cisco PIX Firewall 7.1
  • Cisco PIX Firewall 7.2


May 02, 2007

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