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Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software VPN Web Server Denial of Service Vulnerability

cisco-sa-asaftd-vpn-dos-SpOFF2Re · High · Published · Updated

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. 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-SpOFF2Re This advisory is part of the March 2026 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2026 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication.

Cisco advisory ·CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2026-20039
Cisco Bug IDsCSCwo01785
CVSS ScoreBase 8.6
Base 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.9, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.3.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.3.7, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.3.12, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.3.9, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.7, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.10, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.13, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.8, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.18, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.24, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.26, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.29, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.30, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.35, Cisco Secure Firewall Adaptive Security 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Appliance (ASA) Software 9.18.2.8, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.39, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.46, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.53, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.55, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.56, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.8, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.22, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.24, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.29, Cisco Secure Firewall Adaptive Security Appliance (ASA) 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9.19.1.27, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.28, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.31, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.37, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.38, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.42, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.10, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.21, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.22, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.4, Cisco Secure 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Threat Defense (FTD) Software 6.4.0.4, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.5, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.6, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.7, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.8, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.9, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.10, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.11, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.12, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.13, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.14, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.15, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.16, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.17, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.18, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.5, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.7, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.6, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.7, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.9, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.7.0, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Secure Firewall 3100 Series, Cisco Secure Firewall 4200 Series, Cisco Secure Firewall 1200 Series, Cisco Secure Firewall Threat Defense Virtual

CSAF Product Statuses

Product Status Source CVE Rows
Cisco 3000 Series Industrial Security Appliances (ISA) known_affected cisco_csaf CVE-2026-20039 201
Cisco Adaptive Security Virtual Appliance (ASAv) known_affected cisco_csaf CVE-2026-20039 134
Cisco ASA 5500-X Series Firewalls known_affected cisco_csaf CVE-2026-20039 107
Cisco Firepower 1000 Series known_affected cisco_csaf CVE-2026-20039 158
Cisco Firepower 2100 Series known_affected cisco_csaf CVE-2026-20039 193
Cisco Firepower 4100 Series known_affected cisco_csaf CVE-2026-20039 204
Cisco Firepower 9000 Series known_affected cisco_csaf CVE-2026-20039 204
Cisco Secure Firewall 1200 Series known_affected cisco_csaf CVE-2026-20039 7
Cisco Secure Firewall 3100 Series known_affected cisco_csaf CVE-2026-20039 92
Cisco Secure Firewall 4200 Series known_affected cisco_csaf CVE-2026-20039 26
Cisco Secure Firewall Threat Defense Virtual known_affected cisco_csaf CVE-2026-20039 66

Related Products

Product CVE Evidence
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2026-20039 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2026-20039 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Firepower 1000 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco ASA 5500-X Series Firewalls CVE-2026-20039 Cisco OpenVuln · family-level
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Firepower 9000 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Firepower 4100 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Adaptive Security Virtual Appliance (ASAv) CVE-2026-20039 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Secure Firewall 4200 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Secure Firewall 1200 Series CVE-2026-20039 Cisco OpenVuln · family-level
Cisco Secure Firewall Threat Defense Virtual CVE-2026-20039 Cisco OpenVuln
Cisco Adaptive Security Appliance (ASA) Software CVE-2026-20039 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2026-20039 Cisco OpenVuln
Cisco 3000 Series Routers CVE-2026-20039 Cisco OpenVuln