cisco-sa-asaftdvirtual-dos-MuenGnYRHighCVSS 8.6

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

Published
October 23, 2024
Last Modified
September 23, 2026

🔗 CVE IDs covered (1)

CVE-2024-20260 →

📋 Description

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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is part of the October 2024 release of the Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300"].

CVE-2024-20260 — Cisco Adaptive Security Virtual Appliance and Secure Firewall Threat Defense Virtual SSL VPN Denial of Service Vulnerability (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)

🎯 Affected products182

  • Cisco 3000 Series Industrial Security Appliances (ISA)
  • Cisco ASA 5500-X Series Firewalls
  • Cisco Adaptive Security Virtual Appliance (ASAv)
  • Cisco Firepower 1000 Series
  • Cisco Firepower 2100 Series
  • Cisco Firepower 4100 Series
  • Cisco Firepower 9000 Series
  • Cisco Secure Firewall 1200 Series
  • Cisco Secure Firewall 3100 Series
  • Cisco Secure Firewall 4200 Series
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
  • Cisco Secure Firewall Threat Defense (FTD) Software
  • Cisco Secure Firewall Threat Defense Virtual
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1.28
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.11
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.13
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.14
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.3
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.7
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.14
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.15
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.19
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.23
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.3
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.14
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.18
  • +152 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (6)