cisco-sa-asaftd-vpn-dos-dzv4mQFF: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability

Published Aug 11, 2026
·
Updated

A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected 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-asaftd-vpn-dos-dzv4mQFF

Affected Software

2 affected components
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Cisco Cisco Secure Firewall Threat Defense (FTD) Software

Event History

Aug 11, 2026
Advisory Published
via Cisco·04:39 PM
Data Sourced
via Cisco·04:39 PM
DescriptionSeverityWeakness
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of cisco-sa-asaftd-vpn-dos-dzv4mQFF?

The severity of cisco-sa-asaftd-vpn-dos-dzv4mQFF is rated as 40.

2

How do I fix cisco-sa-asaftd-vpn-dos-dzv4mQFF?

To fix cisco-sa-asaftd-vpn-dos-dzv4mQFF, ensure that you apply the latest software updates provided by Cisco.

3

What impact does cisco-sa-asaftd-vpn-dos-dzv4mQFF have on my network?

cisco-sa-asaftd-vpn-dos-dzv4mQFF can cause the affected device to unexpectedly reload, leading to a denial of service for remote users.

4

Who is affected by cisco-sa-asaftd-vpn-dos-dzv4mQFF?

Organizations using Cisco Secure Firewall Adaptive Security Appliance Software and Cisco Secure Firewall Threat Defense Software are affected by cisco-sa-asaftd-vpn-dos-dzv4mQFF.

5

Is authentication required to exploit cisco-sa-asaftd-vpn-dos-dzv4mQFF?

No, cisco-sa-asaftd-vpn-dos-dzv4mQFF can be exploited by unauthenticated remote attackers.

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.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203