Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

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.

Published

2019-10-02T19:15:12.327

Last Modified

2024-11-21T04:23:20.353

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:N/A:P

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: PARTIAL
Exploitability Score

8.0

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-172
  • Type: Primary
    CWE-755
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco adaptive_security_appliance_software < 9.3.3.9 Yes
Operating System cisco adaptive_security_appliance_software < 9.1.7.4 Yes
Operating System cisco adaptive_security_appliance_software < 9.2.4.8 Yes
Operating System cisco adaptive_security_appliance_software < 9.4.2.11 Yes
Operating System cisco adaptive_security_appliance_software < 9.5.2.5 Yes
Operating System cisco adaptive_security_appliance_software < 9.6.2 Yes
Hardware cisco asa_5505 - No
Hardware cisco asa_5510 - No
Hardware cisco asa_5512-x - No
Hardware cisco asa_5515-x - No
Hardware cisco asa_5520 - No
Hardware cisco asa_5525-x - No
Hardware cisco asa_5550 - No
Hardware cisco asa_5555-x - No
Hardware cisco asa_5580 - No
Hardware cisco asa_5585-x - No
References