CVE-2022-20795

Published on: Not Yet Published

Last Modified on: 05/04/2022 05:59:00 PM UTC

CVE-2022-20795 - advisory for cisco-sa-vpndtls-dos-TunzLEV

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Certain versions of Adaptive Security Appliance from Cisco contain the following vulnerability:

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.

  • CVE-2022-20795 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.
  • Affected Vendor/Software: URL Logo Cisco - Cisco Adaptive Security Appliance (ASA) Software version n/a

CVSS3 Score: 7.5 - HIGH

Attack
Vector ⓘ		 Attack
Complexity		 Privileges
Required		 User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 5 - MEDIUM

Access
Vector ⓘ		 Access
Complexity		 Authentication
NETWORK LOW NONE
Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
NONE NONE PARTIAL

CVE References

Description Tags ⓘ Link
No Description Provided tools.cisco.com
text/html
 URL Logo CISCO 20220420 Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability
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Related QID Numbers

  • 317160 Cisco Adaptive Security Appliance (ASA) AnyConnect Secure Sockets Layer (SSL) Virtual Private Network (VPN) Denial of Service (DoS) Vulnerability (cisco-sa-vpndtls-dos-TunzLEV)
  • 317161 Cisco Firepower Threat Defense (FTD) Software AnyConnect Secure Sockets Layer (SSL) Virtual Private Network (VPN) Denial of Service (DoS) Vulnerability (cisco-sa-vpndtls-dos-TunzLEV)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationCiscoAdaptive Security ApplianceAllAllAllAll
ApplicationCiscoAdaptive Security ApplianceAllAllAllAll
Hardware Device InfoCiscoAsa 5505-AllAllAll
Hardware Device InfoCiscoAsa 5512-x-AllAllAll
Hardware Device InfoCiscoAsa 5515-x-AllAllAll
Hardware Device InfoCiscoAsa 5525-x-AllAllAll
Hardware Device InfoCiscoAsa 5545-x-AllAllAll
Hardware Device InfoCiscoAsa 5555-x-AllAllAll
Hardware Device InfoCiscoAsa 5580-AllAllAll
Hardware Device InfoCiscoAsa 5585-x-AllAllAll
Hardware Device InfoCiscoAsa For Nexus 1000v-AllAllAll
Hardware Device InfoCiscoFirepower 1010-AllAllAll
Hardware Device InfoCiscoFirepower 1120-AllAllAll
Hardware Device InfoCiscoFirepower 1140-AllAllAll
Hardware Device InfoCiscoFirepower 1150-AllAllAll
Hardware Device InfoCiscoFirepower 2110-AllAllAll
Hardware Device InfoCiscoFirepower 2120-AllAllAll
Hardware Device InfoCiscoFirepower 2130-AllAllAll
Hardware Device InfoCiscoFirepower 2140-AllAllAll
Hardware Device InfoCiscoFirepower 4110-AllAllAll
Hardware Device InfoCiscoFirepower 4112-AllAllAll
Hardware Device InfoCiscoFirepower 4115-AllAllAll
Hardware Device InfoCiscoFirepower 4120-AllAllAll
Hardware Device InfoCiscoFirepower 4125-AllAllAll
Hardware Device InfoCiscoFirepower 4140-AllAllAll
Hardware Device InfoCiscoFirepower 4145-AllAllAll
Hardware Device InfoCiscoFirepower 4150-AllAllAll
Hardware Device InfoCiscoFirepower 9300-AllAllAll
ApplicationCiscoFirepower Threat DefenseAllAllAllAll
ApplicationCiscoFirepower Threat DefenseAllAllAllAll
  • cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:asa_for_nexus_1000v:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_1010:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_1120:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_1140:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_1150:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_2110:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_2120:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_2130:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_2140:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4110:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4112:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4115:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4120:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4125:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4140:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4145:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_4150:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:cisco:firepower_9300:-:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @sidfm_jp Cisco ASA Software の DTLS プロトコルの処理にサービスを妨害される問題 (CVE-2022-20795) [41926] sid.softek.jp/content/show/4… #SIDfm #脆弱性情報 2022-04-22 08:00:03
Reddit Logo Icon /r/netcve CVE-2022-20795 2022-04-21 19:38:20
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