cisco-sa-asaftd-eigrp-dos-GOhNejSjHighCVSS 7.4

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

Published
September 16, 2026
Last Modified
September 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-20222 →

📋 Description

A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.

This vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.

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

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP"]. In addition, for further documentation of improvements and fixes in Cisco Secure Firewall products, see Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, and Secure Firewall Management Center Software Hardening Release: September 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN"].

CVE-2026-20222 — Cisco Secure Adaptive Security Appliance Software and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability (CVSS 3.1 7.4, CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)

🎯 Affected products104

  • Cisco 3000 Series Industrial Security Appliances (ISA)
  • 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 200 Series
  • Cisco Secure Firewall 3100 Series
  • Cisco Secure Firewall 4200 Series
  • Cisco Secure Firewall 6100 Series
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
  • Cisco Secure Firewall Management Center (FMC)
  • Cisco Secure Firewall Threat Defense (FTD) Software
  • Cisco Secure Firewall Threat Defense Virtual
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.12
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.18
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.22
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.24
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 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 9.19.1.5
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.9
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1.5
  • +74 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. To reduce the risk of successful exploitation of this vulnerability and as a general hardening best practice, enable EIGRP authentication throughout the network. For more information, see Enable EIGRP Authentication on an Interface ["https://www.cisco.com/c/en/us/td/docs/security/asa/asa924/configuration/general/asa-924-general-config/route-eigrp.html#ID-2179-000002e3"]. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

🔗 References (9)