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Vulnerabilities

Vulnerability · CVE-2026-20022

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…

Published Mar 4, 2026 · catalog updated Aug 11, 2026 · adaptive security appliance software

Last checked Oct 30, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-20022. EPSS is 0.21%. Act only if a listed version of adaptive security appliance software is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Advisory link
Affected products
cpe cisco/adaptive security appliance software · cpe cisco/secure firewall threat defense

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/adaptive security appliance software9.12.1
  • cpe cisco/adaptive security appliance software9.12.1.2
  • cpe cisco/adaptive security appliance software9.12.1.3
  • cpe cisco/adaptive security appliance software9.12.2
  • cpe cisco/adaptive security appliance software9.12.2.1
  • cpe cisco/adaptive security appliance software9.12.2.4
  • cpe cisco/adaptive security appliance software9.12.2.5
  • cpe cisco/adaptive security appliance software9.12.2.9
  • cpe cisco/secure firewall threat defense6.4.0

How to fix CVE-2026-20022

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20022. EPSS is 0.21%. Act only if a listed version of adaptive security appliance software is installed.

Which versions are affected?

Compare what you have installed with cisco/adaptive security appliance software 9.12.1; cisco/adaptive security appliance software 9.12.1.2; cisco/adaptive security appliance software 9.12.1.3; cisco/adaptive security appliance software 9.12.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-823. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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 OSP

  2. Aug 11, 2026 · NIST NVD

    Updated

    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 OSP

Sources

  • CVE.orgVulnerability recordCVE-2026-20022

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20022

    30-day exploitation probability 0.21%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20022

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 30, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 15, 2026