Description

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

INFO

Published Date :

2026-03-04T17:17:49.841Z

Last Modified :

2026-03-05T15:49:08.973Z

Source :

cisco
AFFECTED PRODUCTS

The following products are affected by CVE-2026-20039 vulnerability.

Vendors Products
Cisco
  • Adaptive Security Appliance Software
  • Firepower Threat Defense Software
  • Secure Firewall Threat Defense
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-20039.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact