cisco-sa-asaftd-ospf-ZH8PhbSWMediumCVSS 6.8

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software OSPF Protocol Vulnerabilities

Published
March 4, 2026
Last Modified
March 4, 2026

🔗 CVE IDs covered (6)

CVE-2026-20020 →CVE-2026-20021 →CVE-2026-20022 →CVE-2026-20023 →CVE-2026-20024 →CVE-2026-20025 →

📋 Description

Multiple vulnerabilities in the OSPF feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.

For more information about these vulnerabilities, see the Details ["#details"] section of this advisory.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

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 ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75736"].

CVE-2026-20022 — Cisco Secure Firewall ASA Software and Secure FTD Software OSPF DoS Vulnerability (CVSS 3.1 6.1, CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H) CVE-2026-20024 — Cisco Secure Firewall ASA Software and Secure FTD Software OSPF Heap Corruption Vulnerability (CVSS 3.1 6.8, CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H) CVE-2026-20020 — Cisco Secure Firewall ASA Software and Secure FTD Software OSPF DoS Vulnerability (CVSS 3.1 6.8, CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H) CVE-2026-20021 — Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software OSPF Protocol Denial of Service Vulnerability (CVSS 3.1 4.3, CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) CVE-2026-20025 — Cisco Secure Firewall ASA Software and Secure FTD Software OSPF DoS Vulnerability (CVSS 3.1 6.8, CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H) CVE-2026-20023 — Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software OSPF Protocol Denial of Service vulnerability (CVSS 3.1 6.1, CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H)

🎯 Affected products253

  • 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 9.12.1
  • 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 9.12.2.1
  • 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 9.12.3.12
  • 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 9.12.3.9
  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4
  • 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 9.12.4.18
  • +223 more not shown

✅ Remediation

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

🔗 References (14)