CVE-2026-20022A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated,…

Description

A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition when OSPF canonicalization debug is enabled by using the command debug ip ospf canon. This vulnerability is due to insufficient input validation when processing OSPF LSU packets. An attacker could exploit this vulnerability by sending crafted unauthenticated OSPF packets. A successful exploit could allow the attacker to write to memory outside of the packet data, causing the device to reload, resulting in a DoS condition.

Timeline

Scores

EPSS (exploitation in 30 days)

0.21% · top 89% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.

Affected products

• Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

  • affected 9.12.1
  • affected 9.12.1.2
  • affected 9.12.1.3
  • affected 9.12.2
  • affected 9.12.2.4
  • affected 9.12.2.5
  • affected 9.12.2.9
  • affected 9.12.3
  • affected 9.12.3.2
  • affected 9.12.3.7
  • affected 9.12.4
  • affected 9.12.3.12
  • affected 9.12.3.9
  • affected 9.12.2.1
  • affected 9.12.4.2
  • affected 9.12.4.4
  • affected 9.12.4.7
  • affected 9.12.4.10
  • affected 9.12.4.13
  • affected 9.12.4.8
  • affected 9.12.4.18
  • affected 9.12.4.24
  • affected 9.12.4.26
  • affected 9.12.4.29
  • affected 9.12.4.30
  • affected 9.12.4.35
  • affected 9.12.4.37
  • affected 9.12.4.38
  • affected 9.12.4.39
  • affected 9.12.4.40
  • affected 9.12.4.41
  • affected 9.12.4.47
  • affected 9.12.4.48
  • affected 9.12.4.50
  • affected 9.12.4.52
  • affected 9.12.4.54
  • affected 9.12.4.55
  • affected 9.12.4.56
  • affected 9.12.4.58
  • affected 9.12.4.62
  • and 123 more

• Cisco · Cisco Secure Firewall Threat Defense (FTD) Software

  • affected 6.4.0
  • affected 6.4.0.1
  • affected 6.4.0.3
  • affected 6.4.0.2
  • affected 6.4.0.4
  • affected 6.4.0.5
  • affected 6.4.0.6
  • affected 6.4.0.7
  • affected 6.4.0.8
  • affected 6.4.0.9
  • affected 6.4.0.10
  • affected 6.4.0.11
  • affected 6.4.0.12
  • affected 6.4.0.13
  • affected 6.4.0.14
  • affected 6.4.0.15
  • affected 6.4.0.16
  • affected 6.4.0.17
  • affected 6.4.0.18
  • affected 7.0.0
  • affected 7.0.0.1
  • affected 7.0.1
  • affected 7.0.1.1
  • affected 7.0.2
  • affected 7.0.2.1
  • affected 7.0.3
  • affected 7.0.4
  • affected 7.0.5
  • affected 7.0.6
  • affected 7.0.6.1
  • affected 7.0.6.2
  • affected 7.0.6.3
  • affected 7.0.7
  • affected 7.0.8
  • affected 7.0.8.1
  • affected 7.1.0
  • affected 7.1.0.1
  • affected 7.1.0.2
  • affected 7.1.0.3
  • affected 7.2.0
  • and 36 more

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-9479 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-20022](https://cveledger.app/badge/CVE-2026-20022.svg)](https://cveledger.app/cve/CVE-2026-20022)

Record last updated 4 Mar 2026, 21:34 UTC.