high
7.5
CWE
20
Advisory Published

cisco-sa-asafdt-webvpn-dos-tzPSYern: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Denial of Service Vulnerability

First published: Wed Apr 27 2022(Updated: )

A vulnerability in the web services interface for remote access VPN features of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a crafted HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-tzPSYern This advisory is part of the April 2022 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Credit: This vulnerability was originally found during the resolution a Cisco TAC support caseSaleh Iskandar Indonesia for reporting that the fix for the vulnerability was incomplete

Affected SoftwareAffected VersionHow to fix
Cisco ASA Software=9.16<9.16.2.7=9.15<9.15.1.21>=9.13<=9.14<9.14.3.13>=9.9=9.10<=9.12<9.12.4.35>=9.7<=9.8<9.8.4.44
9.16.2.7
9.15.1.21
9.14.3.13
9.12.4.35
9.8.4.44
Cisco FTD Software>=6.5.0=6.6.0<=6.7.0<Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar>=6.2.2=6.2.3=6.3.0<=6.4.0<6.4.0.13
Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar
6.4.0.13

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this Cisco ASA and FTD vulnerability?

    The vulnerability ID of this Cisco ASA and FTD vulnerability is cisco-sa-asafdt-webvpn-dos-tzPSYern.

  • What is the severity level of cisco-sa-asafdt-webvpn-dos-tzPSYern?

    The severity level of cisco-sa-asafdt-webvpn-dos-tzPSYern is high with a CVSS score of 7.5.

  • How can an attacker exploit this vulnerability?

    An unauthenticated, remote attacker can exploit this vulnerability to cause a denial of service (DoS) condition.

  • What are the affected versions for Cisco ASA Software?

    The affected versions for Cisco ASA Software are 9.16, 9.15, 9.14, 9.13, 9.10, 9.9, 9.8, and 9.7.

  • What are the affected versions for Cisco FTD Software?

    The affected versions for Cisco FTD Software are 6.5, 6.6, 6.7, 6.2.2, 6.2.3, 6.3, and 6.4.

  • How can I fix the cisco-sa-asafdt-webvpn-dos-tzPSYern vulnerability in Cisco ASA Software?

    To fix the cisco-sa-asafdt-webvpn-dos-tzPSYern vulnerability in Cisco ASA Software, upgrade to versions 9.16.2.7, 9.15.1.21, 9.14.3.13, 9.12.4.35, or 9.8.4.44.

  • How can I fix the cisco-sa-asafdt-webvpn-dos-tzPSYern vulnerability in Cisco FTD Software?

    To fix the cisco-sa-asafdt-webvpn-dos-tzPSYern vulnerability in Cisco FTD Software, apply the Cisco FTD Hotfix AA-6.7.0.4-2.sh.REL.tar or Cisco FTD SSP Hotfix AA-6.7.0.4-2.sh.REL.tar.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203