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Advisory severityHigh7.4Cisco

High [CVE-2026-20222] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability

This high-severity Cisco advisory covers CVE-2026-20222 affecting Secure Firewall Adaptive Security Appliance (ASA) Software, Firepower 2100 Series, Firepower 1000 Series.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

cisco-sa-asaftd-eigrp-dos-GOhNejSj Source published Source updated

VulniPulse record published Record updated

CVE-2026-20222
Affected products & platforms
CiscoFirewallASA / Firepower
Open source advisory

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Summary

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.

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.

Affected versions
  • Scope: This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco Secure Firewall ASA Software or Cisco Secure FTD Software and have EIGRP enabled.
  • Release N/A (first fixed: 9.18 and earlier / 9.20)
  • Release 9.20.4.49 (first fixed: 9.20.4.235 / 9.22.3.191)
  • Release 9.23 (first fixed: 9.22.3.26 / 9.23.1.211)
  • Release 9.24 (first fixed: 9.23.1.47 / 9.24.1.221)
  • Release 7.6 (first fixed: 7.6.6)
  • Release 7.7 (first fixed: 7.7.13)
  • Release 10.0 (first fixed: 10.0.2)
  • Release 10.1 (first fixed: 10.1.0)

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • 9.18 and earlier / 9.20
  • 9.20.4.235 / 9.22.3.191
  • 9.22.3.26 / 9.23.1.211
  • 9.23.1.47 / 9.24.1.221
  • 7.6.6
  • 7.7.13
  • 10.0.2
  • 10.1.0

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • This vulnerability is due to improper resource management when handling EIGRP update messages.
Temporary 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.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

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