Vulnerability Monitor

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CVE-2022-20795

A vulnerability in the implementation of the Datagram TLS (DTLS) protocol in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully.

Published

2022-04-21T19:15:08.740

Last Modified

2024-11-21T06:43:34.283

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.8 (MEDIUM)

CVSSv2 Vector

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

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

10.0

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-345
  • Type: Primary
    CWE-345
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco adaptive_security_appliance ≤ 9.16.3 Yes
Operating System cisco adaptive_security_appliance_software ≤ 9.17.1.9 Yes
Hardware cisco asa_5505 - No
Hardware cisco asa_5512-x - No
Hardware cisco asa_5515-x - No
Hardware cisco asa_5525-x - No
Hardware cisco asa_5545-x - No
Hardware cisco asa_5555-x - No
Hardware cisco asa_5580 - No
Hardware cisco asa_5585-x - No
Hardware cisco asa_for_nexus_1000v - No
Application cisco firepower_threat_defense ≤ 7.0.1 Yes
Application cisco firepower_threat_defense ≤ 7.1.0.1 Yes
Hardware cisco firepower_1010 - No
Hardware cisco firepower_1120 - No
Hardware cisco firepower_1140 - No
Hardware cisco firepower_1150 - No
Hardware cisco firepower_2110 - No
Hardware cisco firepower_2120 - No
Hardware cisco firepower_2130 - No
Hardware cisco firepower_2140 - No
Hardware cisco firepower_4110 - No
Hardware cisco firepower_4112 - No
Hardware cisco firepower_4115 - No
Hardware cisco firepower_4120 - No
Hardware cisco firepower_4125 - No
Hardware cisco firepower_4140 - No
Hardware cisco firepower_4145 - No
Hardware cisco firepower_4150 - No
Hardware cisco firepower_9300 - No
References