--- id: CVE-2024-20260 title: >- Update for September 16, 2026: The original 1.0 version of this advisory was specific to the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense Virtual (FTDv) models summary: >- Update for September 16, 2026: The original 1.0 version of this advisory was specific to the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense Virtual (FTDv) models. However, it was later found tha… severity: high cvss: 8.6 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H' cwe: - CWE-789 vendor: Cisco product: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software affected: - secure_firewall_adaptive_security_appliance_asa_software 9.16.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.1.28 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.7 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.11 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.13 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.14 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.14 - secure_firewall_adaptive_security_appliance_asa_software 9.18.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.15 - secure_firewall_adaptive_security_appliance_asa_software 9.18.1.3 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.19 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.23 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.5 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.7 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.9 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.8 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.14 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.5 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.18 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.9 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.39 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.19 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.12 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.46 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.27 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.18 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.53 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.55 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.38 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.39 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.56 - secure_firewall_adaptive_security_appliance_asa_software 9.20.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.42 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.22 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4 - secure_firewall_adaptive_security_appliance_asa_software 9.20.1.5 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4.5 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.24 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.48 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4.8 - secure_firewall_adaptive_security_appliance_asa_software 9.20.2 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.27 published: '2024-10-23' updated: '2026-09-16' sourceUpdated: '2026-09-16T21:17:05.947' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-20260' references: - url: >- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdvirtual-dos-MuenGnYR label: psirt@cisco.com - url: 'https://software.cisco.com' tags: - nvd - cve.org - csaf - vendor-advisory - cisco epss: 0.00594 epssPercentile: 0.4605 ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2024-10-23T18:42:51.960960Z' ingestedAt: '2026-09-14T16:34:40.826Z' --- ## Overview Update for September 16, 2026: The original 1.0 version of this advisory was specific to the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense Virtual (FTDv) models. However, it was later found that this vulnerability affects all Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software platforms. A vulnerability in the VPN and management web servers of the Cisco Secure Firewall ASA Software and Cisco Secure FTD Software platforms could allow an unauthenticated, remote attacker to cause an affected device to run out of system memory or buffer blocks, which in turn could cause SSL VPN connection processing to slow down and eventually cease altogether. This vulnerability is due to a lack of proper memory management for new incoming SSL/TLS connections. An attacker could exploit this vulnerability by sending a large number of new incoming SSL/TLS connections to the targeted device. A successful exploit could allow the attacker to deplete system memory or buffers, resulting in a denial of service (DoS) condition. The memory or buffers could be reclaimed slowly if the attack traffic is stopped, but a manual reload may be required to restore operations quickly. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **cisco-sa-asaftdvirtual-dos-MuenGnYR** · Cisco · affected: 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, … · updated 2026-09-23 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdvirtual-dos-MuenGnYR)