CVE-2019-12677

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device. The attacker would need to have valid user credentials on the affected device to exploit this vulnerability. A successful exploit could allow the attacker to overwrite a special system memory location, which will eventually result in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. A reload of the device is required to recover from this condition. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected. Note: Although this vulnerability is in the SSL VPN feature, successful exploitation of this vulnerability would affect all new SSL/TLS sessions to the device, including management sessions.

• Cisco Adaptive Security Appliance Software

  APP
  Cisco
  9.3 – 9.3.3.9 (excl.)< 9.1.7.49.2 – 9.2.4.8 (excl.)9.4 – 9.4.2.11 (excl.)9.5 – 9.5.2.5 (excl.)9.6 – 9.6.2 (excl.)

• Cisco Asa 5505

  HW
  Cisco
  all versions

• Cisco Asa 5510

  HW
  Cisco
  all versions

• Cisco Asa 5512 X

  HW
  Cisco
  all versions

• Cisco Asa 5515 X

  HW
  Cisco
  all versions

• Cisco Asa 5520

  HW
  Cisco
  all versions

• Cisco Asa 5525 X

  HW
  Cisco
  all versions

• Cisco Asa 5550

  HW
  Cisco
  all versions

• Cisco Asa 5555 X

  HW
  Cisco
  all versions

• Cisco Asa 5580

  HW
  Cisco
  all versions

• Cisco Asa 5585 X

  HW
  Cisco
  all versions